As David said, unlikely, definitely not impossible. Our Man asleep below, boat strikes moving container (driven by wind and current, as well as pitching due to motion of the ocean), even at a large, obtuse angle it's goint to punch a hole.
While I'd agree the way they portrayed it was impossible, the premise that a container could punch a hole in a hull is not. So, far from the most egregious oversight of the film.
On the other hand - A 70 year old man climbing back aboard after being swept over? - Ain't gonna happen!
BTW...Since he was dumb enough to tether himself to the lifeline, he would have never made it to 70. Darwin would have intervened long ago.
The boat rolls with the companion way hatch open (another Darwin award nomination) and gets back on her feet with little water below? Not gonna happen.
Either have him do the right thing and close the companion way in seas that could roll a boat, or let him be a dumb ass and pay the price (he'd have to bring out his mop again... or maybe he would shave first!
) I could go on...
I'll give film makers some room for artistic license. However, this was just sloppy film making IMO.