It's Always Sunny in Philadelphia

The channel broadcasting from the Superstore could not have been emitting in 3D as not one, but two cameras are needed to create a 3D image. There was only one camera shooting the reporter.

In the final scene of the episode where the gang have the last vote, the office door is open and closed between shots.

Trivia: The D.E.N.N.I.S. System

Demonstrate Value
Engage Physically
Nurturing Dependence
Neglect Emotionally
Inspire Hope
Separate Entirely

At the restaurant, the amount of water that was splashed on Dennis' sweatshirt changes between shots.

Trivia: This is the first episode of the series to not feature any scenes at Paddy's Irish Pub.

This episode was dedicated to the loving memory of David Zdunich who passed away in 2009. He played Ernie, a frequent patron of Paddy's pub. His first appearance on the show was in the episode, "Sweet Dee's Dating a Retarded Person."

The Waitress mentions that she and Dee went to the same high school. However, when Dee tells the Waitress to fill out her job application in the 3rd season episode "The Gang Sells Out," the Waitress asks "Did you go to high school?"

You can clearly see the shadow of one of the camera men next to the surrogate couple when Dee decides to have a talk with Mac and Dennis after they introduced themselves as the wealthy gay couple.

When Dennis is showing Charlie how far he can split his legs, you can briefly hear laughter off camera.

During the last scene, the hammer changes position on the bar.

Trivia: There are three paradigms in this episode that the gang attempts to follow.

Mac: The Brains
Dennis: The Looks
Charlie: The Wild Card

Mac: The Muscle
Dennis: The Looks and the Brains
Charlie: The Wild Card

Mac: The Brains
Dennis: The Looks
Charlie: The Wild Card
Frank: The Muscle
Dee: The Useless Chick

You can see some of the pool balls in different positions on the pool table in each shot during the scene after the opening credits where the gang talks about their problem with the homeless.

The billiard balls change position between shots when the gang is conversing with Frank around the pool table.

When Dennis opens the curtain in Charlie's apartment, a boom mike is visible in the top right corner.

When the salesman confronts Mac and Charlie about Frank, Mac's hand on the guitar neck changes positions between shots.

Waldron, the Catholic private school that Dennis mentioned did not have trailers in the back for Special Ed.

Trivia: Dennis trying to remember the name of the waitress is an inside joke. After regularly appearing in the series beginning with the first episode until now, the name of Mary Elizabeth Ellis's character has not been established. She is simply credited as "Waitress" in all the episodes.

The McPoyles' desire for vengeance goes back to the ending of the episode, The Gang Gets Invincible. Dennis stated that Frank's actions will probably come back to haunt them all.

Trivia: This is the first appearance of Greenman.

Trivia: It is revealed in this episode that Dennis and Dee are fraternal twins.