Continuity mistake: When Matt and Lanny get up from the floor to help unwrap the cling-film off Lizzie, the camoflague hat that Matt was wearing stays on the floor (as it fell off when he landed.) But in the next shot as he gets up, the hat is back on his head. In the next shot it is off his head and on the floor in the original place it was.
Continuity mistake: When Matt and Lanny drop all of the bottles of honey and rolls of cling-film onto the picnic table in the garden and begin to talk, during the scene the positions of all the items keeps changing. Additionally there is a bottle of honey stood on the table in between Matt and Lanny which keeps disappearing and reappearing.