Definitely a record for me to speed through this enjoyable puzzle but am completely stumped for my LOI 20a.
FOI was 1a as remembered from Thursday. Favourite has to be 27a.
8d not a place you necessarily associate with markets. Anagram around French word with a 1 letter square not usually used in crosswords as mentioned by Chris earlier.
Neither the actor nor the writer is exactly a household name today. I had to google the former (though I recognized the name when told) but know the latter fairly well. The writer is probably best known through a classic film.
Both are clearly included for thematic purposes, see jono's post early in the thread.