It may not seem big but the gap between Esper Mami's initial manga release and its TV adaptation are 10 years apart. When Mami manga came out First Gundam didn't even exist yet. By the time the TV show started airing Gundam ZZ had ended and TV Dragon Ball was already a year in.

How Yamucha x Tien should have gone. image source: https://t.co/8MSF0aWvA9 https://t.co/3QcTypAhAX

How to draw/colour in your average space man. [ まんがイラスト2大百科 (1985) ] image source: https://t.co/Dgv6nxcAtS

image source: https://t.co/LSS2ZOJUBc

[From Newtype January 1987.]

[From November OUT 1986]

There is also this short scene from the storyboard that is placed right after Char and Nanai's scene (48:34.) It shows Amuro using his psychommu headset a bit more (which is connected into the psychoframe monitor.)

[From Animage May 1980.]

これ見たことある？ https://t.co/ev7E5oTWRe @tsukinure2 @hZKKaFhAma3UqpP @fenarinarsa

Kitazume did one here too.

This is the hardest one to draw. image source: https://t.co/3wIa6c69ZW

Another extra scene in the storyboard that seems to have been cut. It happens right after Char climbs down the stairs of the podium after his speech (52:09.) He also takes off his cape (which he doesn't do in the final version.)