So Larry doesn't explain the tablet's magic to Tilly before he leaves?
...he just says that after tonight, it will be the best job ever or something. I found myself seriously annoyed with that oversight, especially when the first film made such a big deal about how much of a shock it was for Larry on his first night as museum guard.
The whole ending seemed rushed, and left so many dangling threads. Otherwise, I would have put this as my second favorite of the trilogy.
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"I'm sorry, but.." is a self-contained lie.