Not sure if you saw the Krausfadr post on Reddit, but he queried ChatGPT for the changes between the extended and theatrical release, and out came a detailed list with time stamps.
This may or may not be useful if you want to specifically look for anything to change further, such as misplaced “comedy” that I know you love so much.
This was the Reddit post for those who want to see, which is not my work. All credit to Krausfadr for this, which can be useful for other fan editors looking to revise between the theatrical and extended.
www.reddit.com
“Chat GPT - Fellowship Extended vs Theatrical
Ever need a concise summary style list of all differences between versions of a movie for making a fanedit? Let chatgpt 4 come to the rescue:
Here's a comprehensive, chronological list of the differences between the Extended and Theatrical versions of "The Fellowship of the Ring," with timestamps from the Extended Edition:
1. Isildur's Death Extended (0:04:44, 25 Sec): Additional shots of Isildur crawling, being discovered, and shot by orcs.
2. "Concerning Hobbits" Chapter Added (0:07:15, 2.42 Min): Scene describing hobbits.
3. Additional Dialogue with Gandalf and Frodo (0:11:16, 19 Sec): Extra commentary by Frodo while driving to the village.
4. Extended Scene of Hobbit Cleaning Ears (0:11:47, 5 Sec): Additional shot of a confused-looking hobbit.
5. Bilbo with Maps and Missing the Ring (0:12:03, 1.18 Min): Bilbo's scenes with maps and misplacing the ring.
6. Slightly Extended Carriage Scene (0:14:20, 0.5 Sec): A marginally longer shot of Frodo and Gandalf on the carriage.
7. Extended Shot of Gandalf After Frodo Jumps from Carriage (0:14:27, 0.5 Sec).
8. Bilbo Complains (0:16:53, 13.5 Sec): Extended complaints about his greedy relatives.
9. Bilbo's Party Conversation Extended (0:20:48, 1.07 Min): Extended interaction between Bilbo and Mrs. Bracegirdle, and the Sackville-Bagginses.
10. Pub Scene in Shire Extended (0:34:28, 1.14 Min): Extended discussion among hobbits about strange creatures and Bilbo.
11. Sam and Frodo Spotting Wood Elves (0:43:04, 1.35 Min): Sam and Frodo see wood elves heading to the Havens.
12. Extended Gatekeeper Scene in Bree (0:55:37, 3.5 Sec).
13. Extended Hobbits and Strider Conversation (0:56:40, 22 Sec): Discussion about trusting Strider.
14. Midgewater Marshes Scene Added (1:04:29, 1.33 Min): Merry and Pippin complaining about mosquitos and Strider singing an Elvish song.
15. Extended Sam Scene (1:14:35, 11 Sec): Sam talks about trolls.
16. Strider and Boromir at Isildur's Sword (1:29:46, 30 Sec): Interaction between Strider and Boromir.
17. Extended Council of Elrond (1:34:27, 1.11 Min): Boromir's vision and Gandalf speaking the Black Speech.
18. Slightly Extended Shot of Boromir (1:35:40, 2 Sec).
19. Different Cut in Moria Scene (1:38:58, 3 Sec): Added shot of Gandalf and Frodo.
20. Search for Moria's Entrance (1:39:04, 12 Sec): Fellowship searching for entrance.
21. Altered Gandalf Spell Scene in Moria (1:39:50, No Time Difference): Different shots of Gandalf trying to open Moria's gate.
22. Extended Gandalf's Spell Failure (1:39:57, 30 Sec): Additional dialogue and actions by Gandalf and the hobbits.
23. Extended Mithril Explanation in Moria (1:44:15, 75 Sec): Gandalf explains mithril's value.
24. Different Cut in Staircase Scene (1:44:17, No Time Difference).
25. Extended Gollum Discussion (1:45:37, 16 Sec): Gandalf tells Frodo about Gollum's past as Sméagol.
26. Extended Moria Fight Scene (1:52:49, 27 Sec): More action during the fight at Balin's tomb.
27. Different Placement of Troll Scene (1:52:49, No Time Difference).
28. Different Footage in Lothlórien (2:07:23, 27 Sec Cut in Extended Version): The Extended Version has a different sequence in Lothlórien compared to the theatrical cut because now they are initially refused passage.
29. Extended Elvish Town Scene (2:08:27, 9 Sec).
30. Extended Meeting with Galadriel (2:08:51, 10 Sec).
31. Extra Piece in Galadriel Meeting (2:09:01, 8 Sec): Celeborn inquires about Gandalf.
32. Extended Discussion at Galadriel Meeting (2:09:10, About 70 Sec): Dialogue involving Legolas, Galadriel, and Boromir.
33. Lament for Gandalf Extended (2:09:32, 15 Sec).
34. Additional Lament Scene (2:10:17, 30 Sec): Sam comments on Gandalf's fireworks.
35. Galadriel Reveals Her Ring (2:16:58, 10 Sec): Scene closer to the book's depiction.
36. Extended Gift-Giving Scene in Lothlórien (2:19:06, 4 Min 20 Sec Longer): Significant scene where each member of the Fellowship receives gifts.
37. Night Rest on River Extended (2:21:18, 2 Min): Additional scenes with Boromir, Aragorn, Frodo, and Sam.
38. Legolas' Extended Combat (1:18:08, 6 Sec): Legolas kills six orcs instead of three.
39. Aragorn's Additional Fight Sequences (1:18:47, 17 Sec): Aragorn jumps over a tree trunk and engages in more combat.
40. Boromir's Last Stand Extended (1:19:09, 7 Sec): Additional sequence of the hobbits helping Boromir by throwing rocks at orcs.
41. More Rock-Throwing and Boromir Fighting (1:19:22, 4 Sec): Continued fighting with hobbits and Boromir.
42. Different Shot of Hobbits' Reaction (Time Unspecified): Reaction to Boromir being hit by an arrow.
43. Extended Aragorn vs. Lurtz Fight (1:22:07, 2 Sec): Additional shot of Aragorn and Lurtz.
44. Boromir's Dying Moments Extended (1:24:51, 6 Sec): Boromir and Aragorn's final interaction.
45. Fan Club Credits (End of Movie): Credits for the Official Lord of the Rings Fanclub, exclusive to the Extended Edition.”