I mostly put that there because apparently many (North) American kids were horrified and traumatized at Optimus Prime's death in the film (iconic characters dying in animated films was a new concept in the mid-1980s, I guess), so in the European release, at the end of the credits, it said "OPTIMUS PRIME WILL RETURN" so that the European kids wouldn't be locking themselves in their room for a week like (North) American kids supposedly did.