Corrected entry: When Sir Edmund Burton is talking to Cade, he spots a picture from World War 2, mentioning that the bot "looks like Bumblebee." Burton then 'confirms' that it was Bumblebee. This can't be possible as Bumblebee didn't arrive on Earth, according to the Bumblebee movie, until the 80's and WW2 was finished by 1945.
Correction: The Bumblebee movie is NOT a reboot-and even if it was, this movie came out before they started trying to convince us it was a reboot. The more likely explanation for this is that Bumblebee had left Earth after World War II, then came back in the 1980s, as he does in Bumblebee.
Correction: The Bumblebee movie is a reboot of the franchise. It maintains some elements of the old films, but begins a new continuity.