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Who's got a better explanation then the title.

He was channeling the spirit of Christmas.

Originally posted by Q99
He was channeling the spirit of Christmas.

Goku had an emotional problem and couldn't complete the full transformation, afterwards he transformed into a Giant sized wolf-gorilla man and had to resort to hiding behind a mask for over half his life until he meets a village elder who takes his power to the next level.

King Kai explicitly states that Goku became a "Super Saiyan" @ 1:20 of your clip--this also holds true in the canon Jap-dub. Question answered.

Srsly, though: Goku reverted back to his base level right after that clip ends, and wasn't able to assume the form again. My opinion: he was channeling legit SSJ-level power, but wasn't able to sustain it for very long. In other words: it was more akin to a momentary power-up, than an actual transformation.