Unbeknownst to @IMDb I have teamed up with them to give unwanted trivia bits to my family while watching movies.
Night one: Willy Wonka and the Chocolate Factory

Ernst Ziegler, who played Grandpa George, was nearly blind (from poison gas in World War I), so he was instructed to look for a red light to guide him when his character was meant to be looking in a certain direction.

This movie was shot in Munich but the producers had to go outside of Germany to recruit enough little people to play the Oompa Loompas. Many cast didn’t speak English fluently, if at all. This is why some appear to not know the words to songs during the musical numbers.

The Oompa Loompas were known for hard partying off-set, even travelling in a limo together to bars.

The chocolate river was made from 150,000 gallons of water, real chocolate and cream. Because of the cream it began to spoil and, by the end of filming, smelled terrible.

Peter Ostrum (Charlie Bucket) made no other films. He turned down a five-picture contract because he didn't want to make acting his profession. He later became a veterinarian.

When asked his thoughts on the 2005 Charlie and the Chocolate Factory, Gene Wilder stated that he enjoyed Johnny Depp's performance, but disliked the film as a whole, as he was not a fan of Tim Burton as a director, and said he was generally insulted when his films were remade.

It took Gene Wilder two weeks training with two stuntmen to get Wonka's flip right.

Another weeper 1/2: Whenever filmed inside the Buckets' house, Ernst Ziegler (Grandpa George) would take off his shoes and tuck them under the set bed before crawling in to film. When it came time to film the portion of "I've Got a Golden Ticket" where they look under the bed...

2/2...director Mel Stuart wanted to move his shoes out of the way to film the scene, but Ziegler protested vehemently, as he was afraid they would take his shoes away, and he valued those shoes very much so, as they were his only remaining possession from before World War II.

Gene Wilder's acting during the boat ride sequence was so convincing that it frightened some of the other actors and actresses. They thought that Wilder really was going mad from being in the tunnel.

Opinion interjection: Grandpa Joe is still the worst

When Gene Wilder died in 2016, Peter Ostrum changed his social media profile to "Former child actor, veterinarian, inherited a chocolate factory on 29 August 2016".

Most of the chocolate bars were made of wood.

When Willy Wonka drinks from a flower-shaped cup and then eats the cup, the cup itself was made of wax. Gene Wilder had to chew the wax pieces until the end of the take, at which point he spat them out.

The exterior of the chocolate factory was Munich's gas works.

It had been a long time since I’d seen this movie. Gotta love Gene Wilder. Good Day.