3D - The title is a reference to a common phrase "Someone's 3D house of horror". The "2-D" might also be a reference to the show being in 2D.
REO Speedwagon and R.E.M. - Dad's wallet says "REM Speed Dragon". This is a reference to these two bands. -
Whenever someone puts on the 3-D glasses they see and hear something that is really super scary to them.
"Word Play" being used throughout the episode.
Vicky's parents act like they've never met Timmy's parents before and vice versa, yet they met in Channel Chasers when Vicky's parents were first introduced. Though this may be due to Timmy wiping his parent's memories of the events that happened in the later episode.
It is unknown why Timmy couldn't have simply just wished Vicky's family out of his house.
The temple arms on Tootie's glasses are missing in many scenes.
The Nickelodeon TV Schedule displays this episode as "Timmy's House of Horror".
Timmy could have slept in his treehouse instead of Doidle's doghouse.
When Timmy's dad says "Hold me, new friends!", the captions say YOU in place of NEW. It's as if Timmy's dad was meanly nice to Vicky's parents.
Vicky's room is colored differently than how it did in previous episodes.
When Timmy’s dad wears a pair of 3-D glasses, thinking that Timmy’s mom and Timmy are Dinklebergs, the dog leash around Timmy’s neck is gone.
This episode along with "It's A Wishful Life" were aired on May 10, 2005 in the United States, they were produced in 2004 according to the credits. They were also the first episodes to be made in 2004. Every other episode of the season was made the previous year, in 2003.