In mars university when fry goes to the arcade he passes a game and the prizes are a homer or Bart Simpson figure.

Harold Zoid's name is a nod to the famous silent movie star, Harold Lloyd.

When the main characters are watching Fry through the two-way mirror, Hermes is eating popcorn out of a jai alai scoop. This is explained in a deleted scene, where Hermes says someone is stealing silverware from the kitchen so everyone has to use the scoops. The missing silverware is also explained in a deleted scene, where it's explained that the parasites are forcing Fry to eat silverware because they need metal for their city. When the group goes inside Fry to get rid of the parasites, you can see the top of a butter knife as part of one of the buildings.

The banner in the robot bar mitzvah translates to 'Today I am a robot'.

On the DVD commentary, David Cohens mentions that Matt Groening's favourite line in the entire show is 'You watched it, you can't unwatch it. Stay tuned for more Tales Of Interest' spoken by Maurice La Marche as the narrator for this episode. Groening confirms this himself.

In the elves' workshop, Leela turns the controls up to the highest speed- Lucy. This is a reference to a classic episode of "I Love Lucy" where Lucy and Ethel work in a chocolate factory, and the candies come out on the conveyor belt much too fast for them to wrap.

When Bender and Fry are with the Robot-Devil and he spins the wheel to decide whose hands he'll give to Fry, each and every name that appears on the wheel (freeze frame to see them all) are robots that have actually appeared in the series at one point or another. Verified on the DVD commentary.

On the commentary, Matt Groening says that in this episode every major character that has appeared in the show from the very start shows up in this one.

When Lrr and Nd-Nd are dining at the park, trying to get in "the mood", Lrr gets very agitated at his wife. He jumps up and screams to her "One of these days, Nd-Nd, bang. Zoom. Straight to the third moon of Omicron Persei 8." This is a spin-off from the 50s TV show The Honeymooners, in which one of the characters says almost the exact same thing to his wife, Alice.

At the beginning of the episode, when Fry walks into the room wearing an orange space suit, you can see that Amy is busy reading a book (so busy she doesn't mind the odd liquid inside Zoidberg's bathtub being splattered all over her). The book's title is "Martians are from Mars, Venutians are from Venus."

Pazuzu, Dr. Farnsworth's gargoyle, is named after a winged demon in Mesopotamian folklore that protected pregnant women.

Professor says they are going to deliver something to Nigel 7. In The Simpsons (also created by Matt Groening), the two aliens Kang and Kodos are from Rigel 7.

The voice actor for Dwight left to do a film in China before the show was finalised, and didn't return until 10 months later. This meant that the episode couldn't be improved completely until their return, thus it was aired in the fifth season.

Cubert is reading a "Radioactive Man" comic from The Simpsons.

The final "tear-jerker" sequence cuts exactly 12 times - one for every year the dog waited. Submitted by Moose

When Fry goes to the freezing place and discovers that he was sent on a hoax, he puts the pizza on the table, Nibblers eye pops out from the bin (it is revealed that Nibbler pushes Fry into the freezing unit).

The episode's downbeat ending, with Seymour waiting outsize the Pizza restaurant, mirrors the story of a Japanese dog called Hachiko, who spent 10 years waiting on a train station for his master who died at work and never returned. Page on Hachiko.

In the flashback of Fry being frozen, one can see Nibbler's eyeball poking out of the rubbish bin, foreshadowing the events to come in the episode "The Why of Fry". Submitted by Blibbetyblip

When the head of Al Gore meets everyone in the big dome to discuss the problem with Global Warming, he comments that, according to his books, "Earth in a Balance" and "Harry Potter and the Balance of Earth", that everyone needed to protect the Earth from global warming and "black wizards." Then it cuts to Tim the Wizard, from Monty Python and the Holy Grail, sitting in the audience, rolling his eyes and saying "Sure, blame the wizards..." Also, whenever Gore shows that the prize for whoever can solve the global warming problem is a bag of moon sapphires, Tim says "Sapphires? I can use this to get through the gate. hahahaha..."

The scientist with the degree in homeopathic medicine has a degree from Evergreen State College, creator Matt Groening's alma mater. Submitted by Xofer