Keep Circulating the Tapes: There's never been a complete compilation tape/DVD or box set containing all the episodes. There exists only the aforementioned Sing Along tapes (which just have some of the musical segments) and a DVD called "The Very First Alvin Show" (which only contains one of the first episodes, along with the specials A Chipmunk Reunion and Rockin' Through the Decades).
Talking to Himself: Dave, Alvin, Simon, Theodore and Sam Valiant. Though not fully determined but it's rumored that Clyde Crashcup's voice actor Shepard Menken provided Leonardo the assistant's whispering.
The Other Darrin: This special's the first time both Ross Bagdasarian Jr. and Janice Karman took over the vocal roles of Dave Seville and the Chipmunksnote Ross Bagdasarian Jr. voicing Alvin and Simon with Janice Karman voicing Theodore and would be throughout the franchise until the live action/CGI movies with Jason Lee. note Though Ross still provides Alvin's singing voice, Janice does Theodore and the Chipettes' singing voice and Steve Vining for Simon
Real-Life Relative: Husband and wife Ross Bagdasarian Jr. and Janice Karman picked up the franchise. Then later on, their kids Vanessa and Michael started helping them.
Edited for Syndication: 65 episodes were syndicated by Lorimar-Telepictures in 1988. They were the first five seasons, both Valentines and Reunion primetime specials, and the 11 Murakami-Wolf-Swenson episodes from season 6. In most markets, almost every episode from the first three seasons, as well as a handful from the fourth are sped up (similar to PAL) to conserve time for longer commercial breaks. Some season 3 episodes left the speed alone, but trimmed certain scenes out. In U.S. markets, the individual episode title cards from every Ruby-Spears episode has been removed, though international markets retain them.
Bagdasarian Productions keep re-releasing the exact same compilation DVDs (with maybe an additional entry or two with certain releases) year after year, under different titles.
Different episodes, in different forms, continually pop up on various different video sharing sites, such as YouTube, or Dailymotion, though they do suffer from being pulled for copyright, whether from Bagdasarian Productions, or other companies such as Warner Bros. (particularly uploads from Cartoon Network recordings).
Theodore interacted with The Chipettes, Marshanote the woman Dave was about to marry and Vinnie in her second appearance.
Write Who You Know: In "Cookie Chomper III", the dog the Chipmunks adopted is named Lilly. Lilly the puppy was named after Ross Bagdasarian Jr. and Janice Karman's dog, Tiger Lily, who served as the real-life inspiration for this episode. Like Cookie Chomper III, Tiger Lily was also run over by a car and died.
Production of the movie became too time consuming, and with the deadline for the completed project fast approaching, several scenes in the original script had to be re-written to make them simpler for the animators to animate (including the sacrificing scene), or cut from the script completely, thus resulting in a much shorter movie with fewer locations The Chipmunks and Chipettes actually visit.
Early concept art also reveals that the producers originally intended to have a scene where the boys drop off a doll in a church confessional and that the sacrifice scene was originally set on top of a Mayan pyramid instead of a crocodile pit. Another sketch shows the boys in some sort of sewer or prison with two men prying open bars at an opening at the top.
Executive Meddling: Ross Bagdasarian, Jr. and Janice Karman were set to voice the characters for the first film, (they had already done some of the voices in the trailers), and Ross was even going to play Dave, however, Twentieth Century Fox rejected this, and insisted that younger people do the voices and a younger actor for the role of Dave... though, there is speculation that Fox made this move because they wanted more marketable names attached to the movie.
Money, Dear Boy: David Cross makes it especially clear that he's in the movies for the money, noting that being in the first paid for a new house (he seems to have had enough with Chipwrecked though, which he called "literally, without question, the most unpleasant experience I've ever had in my professional life").
Initially, Ross Bagdasarian Jr. and Janice Karman portrayed Alvin, Simon and Theodore in the film, but were replaced at the studio's insistence with younger actors Justin Long, Matthew Gray Gubler and Jesse McCartney respectively.
It's not the first time Steve Vining provided the singing voice for Simon.
The Other Marty: Ross Bagdasarian and Janice Karman recorded all the lines for Alvin, Simon and Theodore.
According to Ross Bagdasarian Jr. (and Zachary Levi) the piano seen in the movie is the actual piano Ross Bagdasarian Sr. used to write and perform “The Chipmunk Song” as well as “The Witch Doctor” that launched the Chipmunks franchise.
Dave's house number is 1958, the year Ross Bagdasarian created the Chipmunks and released "Witch Doctor" and the "Chipmunk Song."