Continuity mistake: In the episode, first Siegfried states that he was contacted in his apartment by Mr Pfister. Later, when talking to Max and 99, he states that Pfister stopped him in the street and asked him.
Other mistake: There are several shots of the carrier pigeon flying home from the group of agents, but in those shots it is not a pigeon. Pigeons do not have wings that big.
Deliberate mistake: Pfister states that there are two minutes until he destroys the world, but when he begins preparing, if you use a stopwatch, two minutes never pass, the clock that Pfister reads from is just exceptionally fast.
Continuity mistake: In the first shot on the rooftop, Pfister is wearing thick glasses on his head. In all the other shots, he has no glasses with no time to remove them.
Other mistake: Siegfried pulls out a pigeon and says that it is going to the Pentagon, but if you see his position compared to an earlier shot of the cages, he pulls out the one that is going to London.