Revealing mistake: When John Candy, Dan Aykroyd, and the two boys are fishing, you can tell they are on a studio lot, with a backdrop of a forest behind them. The reflection in the water from the "shoreline" is about 2 feet (at the most) away from their boat. If they were actually in the middle of a lake, the reflection wouldn't be that close, or for that matter, that clear. (01:00:09)
Revealing mistake: When the family pulls into the lodge parking lot and they all open their doors into trees, the tree John Candy hits with his door wobbles noticeably in the overhead shot. From the regular view you can see it's a smallish size tree, but not small enough to move as much as it does, regardless of how hard he opened the door into it.
Continuity mistake: During the bear in the cabin scene, after Chet puts the door back up, shortly after, you'll see the door is on the floor while Roman is fighting the bear with the oar from the steps. (Also, note in that same shot, you'll see the bookshelf was destroyed to pieces with its books all over the floor. That scene was never shown and must have been cut from the movie).
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