Actor Allusion: In the episode "Flute, Book and Candle", Jimmy dresses up as a beggar, and pretty much looks and acts like the Artful Dodger; which of course was the role Jack Wild played in the movie version of Oliver!, the year before H.R. Pufnstuf premiered.
Dawson Casting: A relatively minor, yet nonetheless interesting case. Jimmy, who starts the series as an 11-year-old before turning 12 in "The Birthday Party", was played by 16- to 17-year-old Jack Wild. Wild's voice didn't properly break until he was about 19, which made it easy for him to sing in a higher register.
Development Hell: Dear Lord, the reboot. A remake of the movie was propositioned by Sony Pictures back in 2000, but plans were scrapped soon after. Eight years later, the Kroffts announced plans for a prequel, and announced that the script was finished and ready to go into production. The last anyone has heard of this project was back in 2010, after they expressed a desire for Justin Bieber to play the role of Jimmy. Now he's clearly too old, covered in tattoos and has a less-than-desirable reputation to boot, that will probably not happen.
NBC originally rejected the title H.R. Pufnstuf altogether, not because they thought it meant "hand-rolled puffin' stuff", but rather they thought the title looked "too effeminate"; Lennie Weinrib even said they were asked by the network, "Why would kids turn off Batman on ABC, and Superman on CBS to watch a powder puff on NBC?"
The network even told the Kroffts to stop having Witchiepoo hitting her flunkies (swiping Orson on the beak with her wand, bopping Stupid Bat upside the head), on the grounds that there was "too much violence".
Despite pleas from the Kroffts, the network would not add to the series' already meager $54,000-per-episode budget, resulting in the Kroffts, and some of their colleagues to dip into their own pockets to help keep the show from going under, even though they were upwards of $3,000,000 over budget. They did, however, give them 10% budget increase for the movie, and didoffer a 5% increase if they would do a second season.
The Other Darrin: While voiced by Lennie Weinrib in the TV series, in the movie Pufnstuf is voiced by Allan Melvin. note Technically, he's voiced a Krofft character before. He was the voice of Drooper, one of The Banana Splits, which the Krofft Brothers created for Hanna-Barbera. Melvin also supplied voices for H.R. Pufnstuf before the movie was produced.
The actress playing Witchiepoo in H.R. Pufnstuf & The Brady Kids Live at the Hollywood Bowl is definitely not Billie Hayes.
Talking to Himself: Only three voice actors worked on this series – Lennie Weinrib, Joan Gerber, and Walker Edmiston – with Weinrib doing a bulk of the voices... in fact, at one point, Orson "takes over" while Witchiepoo goes missing, and starts giving orders to Stupid Bat; Weinrib voiced both characters, and pretty much used the same voice for both of them, which really brings this trope to a different level.