Continuity mistake: In the scene where Doofensmirtz talks about how the sign blocks his view of other people's pain and misery, his window faces the sign. Then in the next shot where the laser blasts the sign, the Doofensmirtz evil inc. logo is facing the brick sign and the windows are facing the other way.
Continuity mistake: During the "Busted" song, the machine Dr. Doofinshmirtz is building is dark-grey and green. However, later in the episode the same machine is light-grey and blue.
Continuity mistake: When Perry is in the cage up in the air, the cage is being held up by a really thick metal wire, but when Charlene Doofinshmirtz (Vanessa's mom) lets Perry out of the cage the wire looks like dental floss.
Plot hole: When Linda (Mom) gets home from her cooking class and greets the boys, she sees nothing out of place. However, just a few moments before, we see the giant laser in the corner of the yard that they forgot to attach to the laser-inator. Wouldn't she have seen this?
Answer: And Bart Simpson should be about 40 by now. Cartoon characters don't age in real time. And are you really counting summer vacation days in a show about children who build spaceships and a platypus who's a secret agent?
Brian Katcher