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Continuity mistake: Blart crashes through a couple of glass doors to get to the birthday cards. There are a bunch of shards of glass in his hair. In the very next shot they're gone.

manthabeat

Continuity mistake: Near the beginning, Paul is putting peanut butter on his pie. The amount significantly changes from the point when he puts it on until the final scene. At first, there is a lot of peanut butter, then there is only a little.

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Visible crew/equipment: When Paul and the bad guy fall through the skylight into the play area with a lot of colored balls, the crash mat becomes visible as they land on it. The mat also throws the balls into the air.

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