Continuity: In the episode "Greased Lightning" the veins in the eyes of the Candace mobile disappear and reappear when Candace is rolling down the hill.

Other: In the episode where everyone goes back to dinosaur times, near the end of the episode after they get back, when the camera zooms in on Phineas and Isabella, Isabella's face is gone - only her eyes remain, but after the camera zooms out her face is back.

Continuity: The crane that is behind the tree has a rope attached to it, but when Isabella comes the rope disappears.

Other: The crane in the garden is behind the tree, but we see just the top of it - and under it is nothing.

Continuity: Candace mentions that Jeremy works at Mr. Slushy Burger, but in later episodes is shown at Mr. Slushy Dawg. Afterwards, it was changed back to Mr. Slushy Burger.

Continuity: When the "arms" take Perry's hands and feet. The "arms" came from the front of Perry, but in the next shot they've come from behind him.

Audio problem: When Candice falls in the mud when talking to Stacy, she sees Phineas and she says "Hey, Phineas.", and her mouth drops open, but when she says Phineas again her mouth does not move.

Continuity: 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.

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?

Continuity: When Dr Doofenshmirtz falls into the toy factory he goes crazy because he sees so many Perrys. Look at the Perry toy beside him first - the toy's foot points up, but in the next shot its foot is on the ground.

Continuity: After the "Har D Har" commercial, the man puts the remote on the table, but in the next shot it's gone.

Continuity: During the song "Ain't Got Rhythm" Swampy's earring switches ears between shots.

Continuity: When Perry is tied to the firecracker he uses a laser watch to burn himself free, but in the next shot it's gone.

Continuity: When Candice gets dragged by Perry in the lake, she flips and lands vertically, but when it zooms out she is being dragged flat.