Whenever I'm digging through version differences, I try to think like a detective: where did the original broadcast cut corners, and why were they cut? A lot of cuts happen for simple reasons — time limits on TV slots, broadcast standards (blood, nudity, or political content), or even music licensing that forces a scene to be altered for an international release. For concrete examples, look at how some classic shows' international dubs altered relationships or visual content; 'Sailor Moon' is a famous case where character relationships and certain dialogue were changed in overseas releases, and 'Dragon Ball Z' often had blood and violent frames toned down on certain networks. Also, 'Neon Genesis Evangelion' famously has an alternate home-video/movie ending in 'The End of Evangelion' that effectively replaces the TV ending, so that's more of a restoration/alternate-cut situation than a simple omission.
If you want to know exactly which scenes were removed, start by comparing the TV broadcast version and the Blu-ray/DVD release: home releases often restore deleted footage or include director commentary that mentions what was changed. Fan-made comparison videos and frame-by-frame breakdowns on forums or YouTube are lifesavers — people will timestamp differences and show freeze-frames. Official release notes, liner notes in collector editions, and interviews with directors or producers are gold for authoritative explanations. I also check episode pages on fan wikis and MyAnimeList comments; they usually note notable edits.
One last tip: track region and platform differences. Streaming services sometimes use the broadcast master, while physical discs typically give the uncut version. I love flipping between versions to catch tiny animation fixes or censored shots — it's like finding hidden director fingerprints, and it makes rewatching feel fresh.