Yes, they did, which is something that isn't entirely that uncommon in a Michael Bay film, or a detail that helps something make sense is just on the screen and not specifically called out. I think its one of his strengths, not spelling out everything in minute detail. It means that if you don't pay attention to the film as your watching it, you will miss stuff. A movie/TV show that spells out absolutely everything is in my opinion extremely boring, especially if it spells out stuff twice or more, once for people paying attention and then a second /third time for those only half watching the film.
I don't think it's a fault, it's a feature, see my comment above.