Okay first of all the transformers looked very cartoon like. They already had their vehicle forms before even going to earth which contradicts of what is shown in the first movie of the transformers franchise. Secondly, optimus is seen in the end with bumblebee whereas in the first movie of the transformers franchise, sam witwicky and mikayla along with bumblebee witnessed the arrival of optimus and other autobots. Thirdly, bumblebee arrives in 1987 which contradicts what edmund said in the 5th movie whereby bumblebee and hot rod helped the americans face the nazis in world war 2. If bumblebee was the first ever transformer on earth, that means megatron has not crash landed yet and sam witwicky’s great grandfather did not encounter megatron and this destroys the whole purpose of the franchise.