The show tends to break the fourth wall a lot:
- In-universe example: In the video game episode, the characters could see their own life bars.
- When the episode's song blames Baljeet for forgetting to bring marshmallows, he starts talking back to it, until Phineas says "Baljeet, would you stop arguing with the soundtrack?"
- When they're building a giant robot dog, Baljeet says, "Like when you made that title sequence."
- Subverted in the movie when we're treated to a duet by the two Dr. Doofenshmirtzes. The original Doof ends the song with, "Twice the evil... Double Doofenshmirtz, comin' at you Fridays!" Alt-Doof replies, "What, are we doing a TV show?" (It should be noted, Friday is typically the day new episodes premiere on the Disney Channel.)
- Though the song does contain a line about Meap's voice actor.
- "Meapless in Seattle" gives us this gem:Meap: My word, we've been falling for a long time!Dr. Doofenshmirtz (in chibi form): Oh, a joke about the commercial break. That's how I want to spend my last few seconds."
- Another episode ended with everyone except Candace turning into a baby. Candace then hopes that this doesn't carry onto the next episode.
- In the "Musical Cliptastic Countdown", Major Monogram and Doofenshmirtz do this occasionally to the viewer at home (they voted, after all), but the rest of the episode is either showing the clips or advancing the unique plot of that episode.Phineas: Hey, where's Perry?
Ferb: He's making a guest appearance on a musical clip show.
Phineas: Hmm... well, that's good for him.
- "Mom! Phineas and Ferb are making a title sequence/Halloween/ Christmas special!"
- "Aunt May! Phineas and Ferb are making a crossover!"
- Doofenshmirtz is hungover in "Crack That Whip" and starts to explain his latest plot:"It all started when I was 15..." [Picture goes wavy] "No, my head hurts too much for a flashback." [Picture returns to normal].
- In "Summer Belongs to You:"Linda: It sure would be helpful if they could just make the days a little longer.
[A "ding" noise signaling an idea is heard as the bottom half of the screen is covered with an "advertisement" reading "You're Watching Television!"]
Phineas: Hey! Do you mind? We've kinda got a visual gag going on here!
[Advertisement disappears, revealing the "ding" was actually from Ferb with a triangle.]
Phineas: Thank you!
- Phineas addresses the audience in "Summer Belongs to You" with the line "No matter where we go, Ferb knows everyone!"
- In "Wizard of Odd", Phineas actually lifts the screen like a curtain and talks to the audience from behind it.
- In "Swiss Family Phineas" Candace is surprised to find Ferb giving a monkey a shower. Ferb says it had to be done.
- Awesomely lampshaded in "Make Play".Candace and Princess Baldegunde look identical.
Major Monogram: Oh, wow, what are the odds.
Carl: Well, it is a cartoon, sir.
Major Monogram: What did I tell you about breaking the Fourth Wall, Carl?
- This little gem from the Musical Episode. The kids who take the poster from the wall (just like in the pilot) are stopped by Buford.Buford: If any one's gonna ride this roller coaster, it's gonna be me. Not one of you lousy extras.
- In "Canderemy", the boys built a giant robot dog, like in the title sequence. This is immediately lampshaded by Baljeet and Buford.Isabella: Whatcha doin'?
Phineas: Hey Isabella, we're building a giant robot dog.
Baljeet: Like when we made that title sequence!
Buford: I'd rather give a monkey a shower.
- When comparing the situation with Vanessa to a cheesy sitcom in "A Real Boy", both Perry and Doof stare directly into the camera.
- In "The Secret of Success", Doofenshmirtz makes a joke about pre-emptions. The show cuts to a test pattern, and Doof says "Very funny."
- "How do you like that, Perry the Platypus? Love Händel, in my flashback."
- Happens in "My Fair Goalie".Isabella: Oh no! Ferb is missing! What are we going to do?!
Phineas: (looks at camera) We'll be right back. (cut to black)
- In "Where's Perry? Part 1," when disappointed Perry isn't coming with them on the plane ride:Phineas: (gesturing to Ferb wearing five neck pillows) And he would have loved this visual gag, too.
- In "Phineas and Ferb Save Summer", in reaction to an outburst from Phineas, Buford says "This must be a special episode, he's yelling at his sister again."
- In "Night of the Living Pharmacist", Doofenshmirtz twice declares that he's done a "Call-Back to something I didn't even see!"
- In "The Inator Method", when the planets are getting ready for their race around the sun, which also counts as Uranus Is Showing by hinting at what the normal pronunciation of "Uranus" sounds like:Buford: Ouranos, check.
Baljeet: Buford, that is not how it is pronounced.
Buford: It is on this channel.