Continuity mistake: When Bob Parr goes to his boss' office to be told off, you can see the door in the background is closed. Bob gets up and walks toward the door which he has now supposedly opened. You never see it physically come into shot, but when Bob is told to close the door, the shot hasn't changed but you can now see the door in shot being closed, which means the door suddenly opened itself. The framing of the shot never changes, therefore we should have seen the door in shot.
Continuity mistake: After the dinner table scene, Bob leaves to go out with Frozone. Then Helen turns to talk to Dash. In the first shot, on Dash's plate all the brocoli pieces sit around the steak. Then the shot changes, a brocoli piece is suddenly sitting atop the piece of steak.
Frozone: Where's my super suit?
Frozone: Where is my super suit?
Honey: I uh - put it away.
Honey: Why do you need to know?
Frozone: I need it!
Honey: Nuh uh! Don't you think about running off to do some derrin' do! We've been planning this dinner for two months!
Frozone: The public is in danger!
Honey: My evening's in danger!
Frozone: You tell me where my suit is woman! We are talking the greater good!
Honey: I am your wife! I am the greatest 'good' you are ever gonna get.
Syndrome: See, now you respect me, because I'm a threat. That's the way it works. There are cities, whole countries who want respect, and they will pay through the nose to get it. How do you think I got rich? I've created weapons, and now I have a weapon only I can defeat, and when I unleash into the...you sly dog! You got me monologuing!