indiana jones may freak him at the end with the boulder scene* (spoilers ahead!)
as a night custodial cm, i've cleaned it with the lights on. the boulder scene is mounted on a massive track with a boulder pushed at you via a motor from behind. the "tunnel" slides on tracks towards your car as you approach, same with the boulder. without all the audio on, it actually makes a audible rushing sound due to it's wheels (the rocky tunnel part) as it is pushed to you, the car "dips" below a tunnel so the rock/boulder is actually above you. lets see if I can draw this... (not to scale, the top line is the boulder/tunnel, the bottom is the "drop" and the <----> is your car picture the gap in the middle as the drop to give you a idea.
the spider scene and maybe the spear throwing sounds in the head hunter scene might cause problems with him, not sure. good luck with him!
Nemo may or may not be one that could scare him?
Piranhas attack the sub at the end, jumping out at the viewing ports, the sub shakes a little and bubbles froth around it like mad
took me a while to figure out why the submarines always smell like someone pissed in them, until I saw the end scene and realized why it smelled like pee kinda difficult to get rid of the smell, especially in summer, but at least disney custodial isn't responsible for changing the wet underoos and shorts