Channel Hop: Started on CBS in 1973, moved to ABC a year later (six weeks after CBS canceled it), returned to CBS in 1982 for a six-year run. Also had syndicated nighttime editions, as well as the daily 1991 and 2002-04 versions. Finally, there's the 2012 GSN version.
Development Hell: No fewer than ten pilots have been made since 1996. Of those, only two have gone to series.
Fan Nickname: The Davidson version was packaged as "The New $100,000 Pyramid", and is still referred to as such to distinguish it from the 1980s run. In a Portmanteau, Osmond's version is nicknamed "Donnymid". This Very Wiki refers to each version by its dollar figure.
Hey, It's That Sound!: The "cuckoo" sound for an illegal clue later appeared as an "illegal clue" sound on two other Stewart games — Chain Reaction and Go, the both of which also borrowed the "plonk" timer.
Substitute announcers after Clayton's death included Alan Kalter (To Tell the Truth, The Late Show with David Letterman), Fred Foy (narrator of The Lone Ranger) and New York-based announcers John Causier, Dick Heatherton, Ed Jordan, and Scott Vincent.
Almost all CBS/ABC episodes from 1973 to about March 1978 are thought to be Lost Forever, minus:
$10,000 (CBS): Episode #3 is held by UCLA (first segment here), #5 was uploaded by a contestant's relative in January 2011, June 13 (with Kaye Ballard and Richard Deacon) circulated for years before getting on YouTube, and the three weeks recorded at Television City (aired November 1973) all exist, with GSN showing 14 of the TVC shows. Given that CBS ceased wiping in September 1972, the status is uncertain.
$20,000: Several 1976 shows, the week of September 12, 1977 ("Kirk vs. Spock", with Shatner's chair throw), and a few episodes from 1978 prior to the earliest one GSN aired; the last 19 minutes from February 9, 1977 surfaced in December 2011, followed by November 2 and 3, 1976 in October 2013. GSN aired about five straight months from 1978 and some scattered episodes from 1979 (including the Junior Pyramid week on July 9); about 15 episodes from 1979-80 (after the latest one GSN aired) also circulate, including the All-Star Junior Pyramid special, an episode of Junior Partner Pyramid, and the finale week.
The Cullen $25,000, the 1981 $50,000, and the 1991 $100,000 (plus certain episodes of $20,000 from 1978-80) have never been rerun although they exist. GSN has aired three or four brief clips of the second Cullen episode with Shatner and Anne Meara.
Some of the New $25,000 episodes haven't aired since their original CBS airings, or even since the days of USA Network (mainly shows from Spring-Fall 1987 and Fall 1983-Summer 1985).
All fifteen shows of $10,000 taped at Television City feature a big-winner clip montage from episodes believed to be gone. Same goes for Cullen's $25,000pitchfilm, which showed ten wins (some from the aforementioned montages, others from subsequent tapings), all believed to be the only surviving footage from their respective episodes.
Uncanceled: The 1980s $25,000 was canned at the end of 1987 and replaced by Blackout, a word-description game from Jay Wolpert. After thirteen weeks, Blackout tanked in the resulting outcry, and Pyramid returned for 13 weeks before it was replaced by Ray Combs' Family Feud.
Bob Stewart developed the show under the working title Cash on the Line and taped a pilot on February 2, 1973; CBS hated everything about it except for the end game, which became Pyramid's main game.
Originally, the Winner's Circle had 10 subjects (which is what TV Guide showed in its synopsis of the debut in the March 24-30, 1973 issue, the bottom four boxes awarding $25 each) but, two nights before taping the premiere, Stewart called CBS and said there was no way anyone could get 10 subjects in a minute. He had a two-by-four plank nailed over the bottom four boxes, which remained during the initial CBS run (taped at the Ed Sullivan Theater in New York) and shortly into the ABC run.
New $25,000 almost didn't happen. Dick Clark was hosting a pilot for a CBS game show produced by Bob Stewart called Second Guess, but the pilot didn't go as well as they hoped it would. After countless attempts to get it up and running, Dick said to Bob "Why don't you just revive Pyramid instead?"...and so, without the need for a pilot, the Television City era of Pyramid began production as soon as possible.