ok then, lets start with the obvious:
he creates the k spear and k grenades right there on screen which takes a certain level of knowledge and research to manipulate an unknown substance
alfred is seen putting the finishing touches on armour thats clearly been created in the cave; alfred even mentions doing patchwork on the voice modulator:
https://www.youtube.com/watch?v=XwiNzV6QMog
on top of that we see bruce doing detective work throughout the film which also takes a degree of intelligence:
https://www.youtube.com/watch?v=xdli3A0mxF0
we see him speak fluent russian which as you know takes intelligence to be multi lingual.
heres another scene of him sleuthing, admittedly they don't get too deep into it but its there; tracking down Wonder Woman, finding out info on Lex and the White Portuguese:
https://www.youtube.com/watch?v=N6DbVMSCyxY
https://www.youtube.com/watch?v=EsIFcaA5Fb0
and finally his tactical skill is shown in the beginning of the warehouse fight in how he neutralizes enemies and their weaponry... employing tactics requires skill, experience and intelligence.
https://www.youtube.com/watch?v=JKSottBl7ow
im sure more intelligence feats will be shown in Justice League but for now these are the examples shown so far