Differences between the test screening and final version of Bumblebee -- seems to indicate that Bumblebee was intended to be a more definitive prequel for Bayformers but was later changed to be a reboot. These tend to be decisions from the studio rather than the director, but it does explain why the continuity is rather ambiguous, as well as Jack Burn's hatred towards Bumblebee. The final cut still explains it as him being nearly killed during the training exercise and seeing how dangerous Cybertronians can be, but the original version gave Burns more gravitas. But apparently the test audience didn't respond as well to a hard-core John Cena so they made him more light-hearted, and a lot of people have said that some of the funniest lines have come from Burns.
I haven't bought a special edition of a Transformers film since 2007 (I've purchased bare bone versions of the sequels), but this makes me want to get the bonus special feature DVD. Hopefully it will show some of these deleted scenes, especially the one of a G1-style Megatron frozen in ice!
P.S.
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