Seasons two and three are the only identical opening credits. New footage of the cast was recorded for every season thereafter, excluding the 10th (final). However, the last two are not identical, due to the major cast changes and adjustments: during the ninth season, Jason Priestley and Tiffani Thiessen left, Luke Perry returned, Daniel Cosgrove and Lindsay Price were promoted to regular cast members, and newcomer Vanessa Marcil joined the cast. She left during the 10th season.
This isn't Beverly Hills! It's Knot's Landing!
In the first season, when Donna tries out for school DJ, she is referred to as Donna Morgan. Throughout the entire show, her name is Donna Martin.
During the original run and earlier syndication airings, the show featured a lot of music from up to the time the episode takes place. However, due to issues with rights regarding the songs, all DVD and Hulu versions change the majority of the original soundtrack with generic replacements. There are also episodes with scenes edited out that would mention certain songs or music artists. It is not known if there will ever be a future release that retains the original music with unedited episodes.