Futurama

During the intermission, just after the Robot Devil gives Leela Calculon's ears, she asks if he is going to take her hand. The Devil robot holds her left hand and tells her to go enjoy the opera. When the angle changes he's holding Leela's right hand.

Fry, Leela and Bender are the only characters to appear in every episode of the series. In second place are the Professor and Doctor Zoidberg who both appeared in 70 out of 72 episodes. The Professor did not appear in "Where No Fan Has Gone Before" and "The Why of Fry"; Doctor Zoidberg did not appear in "Space Pilot 3000" and "Mars University".

The windows in Fry and Bender's apartment keep changing positions.

When Bender tells Fry to "get your coat", Fry is already wearing it, just as he always does.

During the opera, Beezlebot picks up the Preacherbot and pulls him on stage. In 1ACV09 "Hell Is Other Robots", Preacherbot keeps saying how evil Robot Hell and the devil are, so it is a bit odd that he does not react to being picked up by Beezlebot.

Fry appears on the album covers for his music shown in the TV ad Zoidberg is watching with his own human hands, not the devil's robot hands.

Bender opens his safe marked 'Bender's Loot' some how from the inside where the door has no handle/combination on the inside.

All of the parents protesting Bender are fathers (or F.A.R.T.ers). Mothers, apparently, have no such issues with Bender.

The other kids at Cubert and Dwight's "cool party" are the same orphans that Bender adopted in The Cyber House Rules. There is also a Horrible Gelatinous Blob kid present, though it's presumably not Bret Blob (the blob who bullied Dwight and Cubert in Route of All Evil), unless they've patched up their differences since then.

Opening theme promotion: CONTROLLING YOU THROUGH A CHIP IN YOUR BUTT SINCE 1999

The human character on All My Circuits is named "Human Friend".

The CEO was an Apple; he was running what appeared to be Quicktime and the sound editing program that comes with new Apples.

Cigar names: Bender's Favorite, Benderillos, Bender Smokes.

Bender has a plug near his crotch plate when he was plugging in the TV. In the previous episode, he couldn't find a plug.

LOOK HARD: Studio Sign: TAPING IN PROGRESS: ALL WELCOME (WRITERS KEEP OUT).

In the audition room there is a poster of Zoidberg's uncle Harold Zoid on display.

When Hermes takes the 'Jamaciaan hand-rolled cigarette' away from the boys, it is still lit. Hermes stuffs it in his jacket pocket. You can briefly see smoke coming out of his suit, before it switches to the next scene.

eMotitron Junior has a mother who looks after him. This doesn't make sense, as robots aren't born. His mother is surely a big arm, not a humanoid robot.

I'm aware it's a mick-take, but wouldn't Macaulay Caul-con's hands being fixed to his face be really, really impractical for a robot?

When Antonio broke on set, why didn't they just make an identical robot instead of casting a different one?