Dude, We're Gettin' the Band Back Together! (Part 1 & 2) - S1-E22
Continuity mistake: During the song "Ain't Got Rhythm" Swampy's earring switches ears between shots.
logan crewsAudio 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.
logan crewsCandace Loses Her Head - S1-E7
Continuity mistake: At the starting of the episode when Phineas wakes up you can see right next to him there are two pillows on his bed but when he sees the calendar and is about to throw the pillow on Ferb you can see that there is only one pillow.
gunzz99Continuity mistake: When Phineas, Ferb, and Candace go to the stairs, the door has 'stairwell' written on it. Then, when the bubblegum case falls, before it goes through the door, it reads 'stairs', but once the door is open, it's back to 'stairwell' again.
moonstripeDude, We're Gettin' the Band Back Together! (Part 1 & 2) - S1-E22
Continuity mistake: During the end of the episode, Phineas is video taping his parents, but what he is recording is a different angle that what is being shown on the screen. From Phineas' angle, the camera is only showing the back of his mom's head. However, the big screen above the band shows that the camera angle can see both of his parents' faces.
Day of the Living Gelatin!/Elementary, My Dear Stacy - S2-E6
Continuity mistake: In "Day of the Living Gelatin" when you first see the TV in Perry's lair, the letters MM are visible on Monogram's jacket. In the close-up they are gone. (00:04:40)
Low CowContinuity mistake: In the episode "Don't Even Blink", during the song segment, Phineas changes from playing the guitar lefty and righty several times.
Continuity mistake: In the episode "One Scare Ought To Do It," when the haunted house comes back, it is stuck to the Disinvaporator. The clock says 5 seconds left, but when it cuts to the closer shot of the clock, it lost 3 seconds, which means that 2 seconds are left.
josh26220Continuity mistake: One of Ferb's eyes is egg-shaped while the other is normal. Whenever he turns his head, the egg-shaped eye is always furthest away.
Continuity mistake: Candace's neck is being measured in length for the fashion show, and an assistant is using measuring tape very close to her. In the next shot, he has completely vanished.
bobthedancingdonutCandace Disconnected/Magic Carpet Ride - S3-E5
Other mistake: During the Magic Carpet Ride episode, we see Candace and Stacy inside the Better Panda Chinese Restaurant. During the shot with Candace and Stacy at the table, the old man's eyes merge together.
BaddabingDude, We're Gettin' the Band Back Together! (Part 1 & 2) - S1-E22
Continuity mistake: You can see Candace hugging Phineas. But in the shot directly after that, they're no longer hugging.