Continuity mistake: Bob's right eye keeps changing color back and forth between green and brown.

Minions (2015)
1 suggested correction
Directed by: Pierre Coffin, Kyle Balda
Starring: Sandra Bullock, Michael Keaton, Allison Janney, Jon Hamm
Other mistake: Two cars with the same license plate numbers are seen as the minions are hitch hiking on the road. The plates of the hippie wagon and the old lady's car both read D-6413.
Scarlett Overkill: Work for me, and all this will be yours: respect, power...
Stuart the Minion: Banana!
Scarlett Overkill: ...Banana.
Question: It is 1968, and in the trailer it says "42 B.G" which 42 years later would be 2010, which is the first film. But the ending of this movie implies that the minions have been working for Gru since he was a child. So why is "42 years Before Gru"?
Chosen answer: The writers wanted to keep Gru's cameo at the end of the film a secret for the fans of the franchise. So, saying "42 Years B.G" (before Gru) in the trailer doesn't give the surprise away.






Suggested correction: One of Bob's eyes is green and one brown so when he faces left or right one side is green and one is right.