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Gag Reel:
Insert disc 6 of the DVD set and form the "Main Menu" go to the "Special Features" and there select the menu entry 'Universe of Babylon 5'. Now press your Right button twice and you will have access to a gag reel.
Reported by: KeithL.Callbeck, PurpleDave

Extended Opening Sequence:
Go to the 'Personell Files' in the 'Universe of Babylon 5' sub-menu. Once again press your Right button twice to highlight the '5' on the screen. It will give you access to see a 51 second split-screen version of a B5 station flyby sequence. The footage appears to be a slightly earlier version of the flyby seen in the background after Ivanova's monologue in the Season 3 opening credit sequence. It's a little longer, starting with a shot of Espilon 3, and features a pair of patrolling Starfuries and a launching cargo vessel that did not appear during the final credit sequence.
Reported by: KeithL.Callbeck, PurpleDave