Krillin says that Android 18 was once human but was turned into an android by Dr Gero. The original manga and the Japanese show said 17 and 18 and all Gero's artificial humans were cyborgs, but the American dub had called them androids; this line of dialogue provides a solution to the issue.
A man who strongly resembles Mercenary Tao from Dragon Ball (1995) is seen standing right behind Goku, in the scene where all the fighters entering the tournament are being addressed by a tournament staff member.
When Sharpner tries to jump on the Great Saiyaman from above, he misses because Gohan bends down and picks up a frog that looks similar to Captain Ginyu in the Namekian Frog's body.