Gloria is shown in her day-job instructing an elderly man how to drive. The man's hat disappears in one shot, then returns in the next. Further more, in the shot after that, the colors of his coat and hat have changed.
Near the end, Gloria is so glad to see Matt is alive that she throws her mask straight up into the air. When it cuts to a wide shot, it is nowhere to be seen.
Matt and Bruce are already in Japan when Matt decides to call in a team of M.A.S.K. agents. But both can be spotted at Boulder Hill during the Mask energizing scene before the rest of the team joins them in Japan.
When the M.A.S.K. computer reports the Endurium theft, it mentions there is only one auto-surveillance photo of the suspect available, yet manages to show three different angles of the scene.
When Miles Mayhem uses his Viper mask, he mispronounces it's name as 'Sniper'.