Revealing mistake: When Stewart's wrestling with the alligator look closely and you can see the black strap keeping its jaw shut.
Continuity mistake: Grover's eyes are closed when he's rolled over by Pickett, then his right one's open a shot later.
Continuity mistake: Karen's barefoot on the dock and walking to the house, but once in she's suddenly wearing sandals.
Continuity mistake: Pickett Smith has his shirt sleeves rolled up at the movie's beginning, then they're rolled down and buttoned then rolled back up before his canoe gets knocked over.