Zoidberg is a slug, then a trilobyte, then an oyster, then a lamprey, a fish, then an urchin, then a sea anemone, then finally a coral.
Bender has braces on his teeth when he grows younger. Why exactly does a robot need braces?
Bender wasn't born. He was put together by a machine.
Farnsworth's clothes age and de-age with him, but the others' outfits only change to loincloths in the Fountain of Aging.
Leela shows no effect from being in the Fountain of Aging until after she comes out; she is still a teenager the whole time she is in the pool but isn't an adult again until she emerges.
How could Farnworth fool everybody about his age (as mentioned in A Clone Of My Own) if a simple reading with the age-gizmo could tell his precise age, within one decimal?
RESPONSE: It could have been something unavailable to the general public at that time, or more than likely it was his own invention so he could have easily kept his age secret.
Inez complains she'll never have a grandchild. What about Kif's tadpoles? Maybe the Wongs don't accept them because it was Leela's DNA that impregnated Kif, but not Amy's.
In the "Mothers Day" episode, Bender gives a picture of himself when he was 2 months old. He was full grown then regardless of his robot DNA.
The rejuvenation seemed to have affected each by subtracting not a fixed age but a percentage age, therefore all would have been about 40% of their previous age.
This episode takes place after Leela's Homeworld, so it's established that Leela is a mutant. However the general public must still believe that she's an alien, otherwise she would be banished to live in the sewers.
Opening theme promotion: SOON TO BE A MAJOR RELIGION
Captain Yesterday's medallion is a C overlayed by a Y.
Leela's sign on her super hero outfit is a hand holding a rolling pin. Many fans mistook it for the communist symbol. The arm was suppsoed to make a C to stand for Clobberella.
LOOK HARD: Teddy Roosevelt: Museum Founder; No Admittance Without $5.00 Suggested Donation.
The piranhas that were "persuaded to walk on land" use Dr. Wernstrom's reverse SCUBA suit (minus the wetsuit).
The creme said that it gives superpowers to humans, but Leela is a mutant.
RESPONSE: But she is a human mutant (that is, her DNA is mutated from human DNA), so it's quite probable that the creme might have similar effect on her as on normal humans.
Powers listed on creme: The powers listed on the tube included superstrength, superspeed, and aquatic telepathy. But it failed to mention invulnerability, despite the robber's foiled mugging of Fry and Leela. Remember? The laser bounced off of Fry, and the pipe over Leela's head just got dented...without either person getting hurt.
When Fry and Leela are taking back the remains of the Pi-Kea machine, you notice it there behind them in a perfect balance. But when the scene shows them backing up when the robot was about to shoot, the box is gone!
Leela yells at Fry for nearly giving away his identity, but yet she says his name several times in public while they were still in costume.
Despite the Mayor's statement, we never saw the New Justice Team damage anything in the museum. All the damage was done by The Zookeeper's animals.