In the shot where Kim and Jason slide down the rainbow with the Care Bears during the "Nobody Cares Like A Bear" song, Tenderheart is also on the rainbow. Tenderheart is actually on Earth trying to save Nicholas from the Evil Spirit at that very moment.
When Brave Heart Lion is fighting the tree monster, he's shown with a tummy symbol in one shot.
When the Care Bears on the Star Boat are giving the evil spirit the "Care Bear Stare" you can see Friend Bear standing on the upper part of the boat, even though she is over on the cliff with Secret Bear giving a separate "Care Bear Stare".
The Evil Spirit throws Nicholas's shoe with the gum on it into the potion cauldron. In the next shot, Nicholas has both shoes on again.
When the evil spell takes over the tree in the Forest of Feelings, Brave Heart Lion has his symbol on his belly in the shot as Swift Heart Rabbit is coming to the rescue, even though they don't get their symbols until the end of the movie.
The word "magician" is spelled "magicinan" on the cart when Nicholas bends down to collect the spiders web.
Before Nicholas casts the final spell, there is a brief glimpse of Tenderheart Bear, but when he shouts out, "No!", he moves, but his shadow doesn't move.
During the "Care Bear Family" song, when everyone is walking up the ramp, the outside is dark and cloudy, which it shouldn't be anymore since Grumpy Bear and Good Luck Bear fixed the rainbow beamer.
A sack in the background at approximately 33 mins greatly resembles a phallus. The same sack appears in other scenes but appears completely different in shape and size.
Tenderheart Bear entrusts Jason (a boy he barely knows) with a very important key instead of holding onto it himself - this would be a better safeguard against the key getting lost.