It is revealed that Timmy Turner was the reason Denzel Crocker lost his fairies and went insane about them, although Cosmo is also to blame by turning on the microphones.
March 15, 1972 is the date that Denzel Crocker lost Cosmo and Wanda as his fairy godparents and became a hunchback, lost most of his hair, and other defects due to being overexposed to the laser used by Jorgen von Strangle to wipe Crocker's memory.
Timmy says, "FAIRY GODPARENTS!" and makes crazy poses like Crocker normally does when he learns that he previously had them.
The reason the Dinklebergs live next door to the Turners is because Mr. Turner took the "For Sale" sign in front of their house and tossed it backwards, causing it to land in the neighboring house in which the Dinklebergs shortly pulled up and bought.
Crocker's car license plate reads "FAIRIES".
Crocker had an evil babysitter named Vic, who highly resembles Vicky.
Principal Waxelplax was once in love with Crocker until their college years when she found out how crazy he was at his presentation.
It is revealed that Geraldine is the first name of Timmy's principal.
Dinkleberg was once the boyfriend of Mrs. Turner from when they were kids until college when he ended their relationship after he got rich from his pants.
Mr. Turner was once a janitor while in college.
It's revealed that Timmy's hat is pink because Mr. and Mrs. Turner had bought it, along with other girl toys, expecting to have a girl instead of a boy.
Denzel Crocker was considered a hero in Dimmsdale thanks to the help of Cosmo and Wanda as a kid, though he became hated once everyone's mind was wiped.
When 70's Jorgen forbids Timmy and his fairies from ever returning to March 1972, he allows then to visit other months of that year on the proviso they don't interfere with the election of "President McGovern", thus suggesting Timmy (or another god-child) somehow caused that year's presidential election to end in Democratic candidate George McGovern winning instead of Republican candidate Richard Nixon.
This episodes also features the predestination paradox as Timmy Turner is the cause of Denzel Crocker losing his fairy godparents while Timmy tried to prevent it, inadvertently revealing his godparents and getting them taken away.
In the beginning of the episode, if you look closely at A.J.'s DNA tracking device, it says that Mr. Crocker is 5'10 tall, weighs 128 pounds, and his hair is "fake".
During his speech as a child, Denzel Crocker claims that he was born in a log cabin.
This reveals that Mr. Turner has been jealous of the Dinklebergs since the 70's.
This reveals that Denzel Crocker used to have Fairy Godparents when he was a child.
This is the first time a device is used to wipe someone's memory, also establishing that when your fairy's existence is reveal, all memory of them is erased.
Men In Black - The way that Jorgen and the fairies in black made Denzel Crocker and the other people forget about fairies is the same way Agent K and Agent J wiped people memories.
Flashdance, Michael Sembello - "Wow! She's a maniac, that's for sure!" - Dad says this when Mom is dancing in place, then sits down and water splashes on her. This is in reference to the popular 80s movie "Flashdance". Also, the phrase "She's a maniac" appears in the song "Maniac", which was used in that movie.
Devo - The four guys with the keyboards in red hats that were seen entering the Belinda Carlisle Auditorium are based on the new wave band Devo.
Back to the Future - When Timmy travels to the 80's, you can see a DeLorean leave to time-travel. Also, March 15, the day where Crocker lost his fairy godparents, is also the day where George McFly (one of the main characters of the BTTF Trilogy) was murdered by Biff Tannen (another main character) in the alternate 1973 (also known as "1973A").
March 15 - The date, March 15, is also known as the Ides of March, the date Julius Caesar was assassinated.
Motorola - Chet Ubetcha used to be taller, but was made short by the radiation from a bulky 80's cellular phone resembling the Motorola DynaTACthat he was holding next to him.
When Mrs. Crocker was bringing Mr. Crocker a March 15 cake, the background behind her briefly shows the outside, even though the scene is taking place in Mr. Crocker's bedroom.
If you pay attention to Crocker's shadow while he's giving his speech, during the whole thing, his shadow's mouth stays in one position.
Also, Mr. Turner was called "Dad" back then in Father Time, but in this episode when Timmy calls him that, his Dad does not recognize that name and attempts to correct Timmy with his real one, but is interrupted by a truck.
Since "Father Time!" takes place in 1970 and this takes place in 1972, it is possible that Mr. Turner outgrew the name to the point of not remembering it.
In the 80s scene some thing were non-existent yet, just like the DeLorean of Back In The Future or the music career of Belinda Carlisle.