A wall of a building falls off/gets blown up. A hero looks over the edge and takes running jump through a window of a building right next to it - that's movie realistic. A hero runs, without looking, then jumps through a window and then into a window of another building, things get iffy. People start asking questions instead off explaining to themselves "well he did check to see if can jump over".
As with many things in movies, it's all about indicating and giving subtle hints. Limited time of a movie means counting every scene, because every scene is important if you want it to be and every second can be effectively used to raise drama and tension and keep the tempo going. And that's why some thing just can be believable even when it's not even close. Guy taking out a helicopter with a Glock, a bus jumping over a hole in a highway under construction, loads of people shooting at the hero but keep missing etc.
On the other hand, surviving an atomic bomb explosion in a fridge, yeah it might be doable but there's so many things about it that just don't seem likely and so many people don't really understand about it, they'll probably question it more. If it was a regular bomb/explosion, that part would be much more believable (not the flying over a cart part, just the surviving part).
Instead of using it in it's advantage (like let's say James Bond's or Batman's gadgets) where science is iffy but can be explained with "well it's high tech/magic", in Indy 4 fridge escape it's almost like an uncanny valley effect.