I would say that the first movie may have a chance to be considered as canon.
The World's Strongest: Piccolo wasn't around when Goku utilized Kaioken and the Spirit Bomb.
Tree of Might: Piccolo, Yamcha, Tien and Chaotsu were still dead around the time Goku learned to upgrade his Kaioken to level 10.
Lord Slug: By the time Goku arrives back to Earth, he is already capable of performing the Super Saiyan Transformation there was no need for him to use the False Super Saiyan Form. In this movie, they have Gohan portrayed as he was on Namek, Gohan was older when Goku returned to Earth.
Cooler's revenge: Same thing, Goku could transform into a Super Saiyan easily by the time he returned to Earth but they make it look as if he had a difficult time with the transformation.
Cooler's return: They have Dende as the new guardian of Earth. At this time, Goku became a Full Power Super Saiyan along with Gohan, Gohan is older than what he was when everyone fought with the Androids. On top of that Vegeta could undergo the Super Vegeta Transformation. Since Dende is the new guardian for Earth, Piccolo should have already fused with Kami making him more powerful. Meta Cooler is a bit surprised with Goku's instant transmission technique, However Goku should have been able to use instant transmission when he first fought Cooler(When Goku returned to Earth, he could transform into a Super Saiyan easily and use the Instant transmission technique.)
Super andriod 13: I would like to say that it was possible to fit this one in, because Goku has already to recovered from the heart virus and returned to the crew, however they did not have any free time on their hands considering that they went straight to Kami's lookout to go to the next level of Super Saiyan.
Broly Legendary Super Saiyan: May be possible for this one to fit in because they did have some free time on their hands before the Cell Games begin. Knowing Cell, Why would he allow someone like Broly to slip out of his hands?
Bojack Unbound: Another possibility to fit in, At this time Cell has already been defeated, and they had lots of leisure time on their hands, perhaps 7 years of it. Not sure if Gohan can go into SSJ2 easily.
The Second Coming: Not sure on this one. They had a lot of time on their hands to fit it in. However, Goku did not return to Earth until the Tournament.
Bio Broly: Took place during the tournament but they went on to fight Babadi and his crew, plus Goku was still around when the tournament was going on. At the they, show him back in Other World.
Fusion REBORN: They had this take place during the other world tournament however The tournament by Janemba. They show Goku being able to go SSJ2 and SSJ3 but he didnt do this until after the other world tournament. Plus Gohan is capable of reaching the Mystic level and Trunks and Goten can undergo the fusion. Speaking of fusion, Goku and Vegeta didnt meet back until they returned to Earth. If they had the Gogeta fusion I don't think they would have needed the potara rings for Vegetto. Besides, Vegeta would have preferred the temporary fusion over the Potara fusion seeing that he doesn't like Goku very much let alone being fused with him forever. Because this movie picked up right after the Other World, Goku did not have the ability to turn SSJ2 and SSJ3. This also cancels out the fusions, Vegeta's death and Gohan's Mystic Level. Also Goku mentioned Buu to Janemba but Goku never heard of Buu until after the World Martial Arts Tournament!!!
Wrath of the Dragon: This is a great possibility of all of them. They had a 10 year peace period. Buu is already defeated, everyone is at the levels they needed to be at. Of the 13 movies, this one should make it.
The Bardock Story: Extremely possible, takes place before the events of DragonBall!!!
History of Trunks: Tells the story of Trunks past life in the future before he went back in time for his encounter with Cyborg Frieza and King Cold.
Originally posted by Kento
It would have made a bit more sense if Trunks hadn't of been in Bojack Unbound, though either way it can still easily fit better than any other movie.
Dialogue from Bulma confirms that Trunks came back form the future to check on things. In doing so he happned to get caught up in the tourney at the start.
Originally posted by atv2It took place after Buu was defeated not during the tournament. 18's coming to get the money Satan owed her for loosing the tournament.
Bio Broly: Took place during the tournament but they went on to fight Babadi and his crew, plus Goku was still around when the tournament was going on. At the they, show him back in Other World.
Originally posted by First_Tsurugi06Really? I missed that completely. Still would make more sense not to have Trunks in it though.
Dialogue from Bulma confirms that Trunks came back form the future to check on things. In doing so he happned to get caught up in the tourney at the start.
Originally posted by Kento
It took place after Buu was defeated not during the tournament. 18's coming to get the money Satan owed her for loosing the tournament. Really? I missed that completely. Still would make more sense not to have Trunks in it though.
If that was true, Goku shouldnt still be in other world, he should be on Earth at that time. (The ending shows Goku back in Other World)
Originally posted by atv2Hence a big part of why it's Non-canon. It can't take place during the tournament. They are back at Mr. Satan's house trying to get the money that he hasn't paid 18 yet for letting him win. It's after the tournament is over, and Satan is crowned the winner. Goten and Trunks don't even fuse so Buu probably never attacked in that universe.
If that was true, Goku shouldnt still be in other world, he should be on Earth at that time. (The ending shows Goku back in Other World)
Originally posted by Mr. Rhythmicit cant fit because in this movie krillin already knew who gohan was whilee in the first DBZ episode nobody except for chi chi and goku knew who gohan was.
I found out where "Dead Zone" fits(well, or if you count it, I do): A little while before the DBZ series. If anything, it should've been called "Dragonball The Movie" instead of "Z". It completely continues the last story of the first series, and can serve as an introduction to Kami.
Originally posted by yungz22
it cant fit because in this movie krillin already knew who gohan was whilee in the first DBZ episode nobody except for chi chi and goku knew who gohan was.
Except that if you look at the fact that Krillin was already busy with fighting a villain, escaping the Dead Zone, and the long gap in between events, then it could work.
Oh, and you seem to forget the GARLIC JR. STORYLINE SEQUEL TO THE MOVIE.