Other mistake: When Tom Hanks is walking down the stairs a chainsaw comes through the wall. If you look at the wall a second earlier you can see a line where the chainsaw is supposed to come through.
Other mistake: When Walter had to go to the hospital, he asked the Klopeks to pick up his mail. However, a mail slot is built into Walter's front door, so the mail carrier would drop the mail through there, directly into the house. There was no need for the Klopeks to gather the mail and keep it at their home. There was no outside mailbox, and it was established that the Klopeks went inside Walter's house. If anything, the mail should have been picked up off the floor and left on a table.
Answer: It's unlikely he could have survived in real life, or if he did, he'd be far more injured and/or permanently maimed, but this is a comedy movie, and reality is often ignored.
raywest ★