When Sam says to Annie, "when I'm 60, you'll be 22" is not correct.
Sam Malone is between 40-41 years old.
If Annie is going to be 22 when Sam is 60, then she's between 3-4 years old here, when clearly she's a teenager.
At the end of the episode, Carla walks into the bar with her babies. They are very clearly just dolls.
It is against Massachusetts law to employ a minor in a bar. Sam and Rebecca would both know this, yet they hire underage Annie Tortelli as a waitress.
Laurie would not have been able to hide the fact of being Evan Drake's daughter, because she would have provided her surname, also his, on her employment documentation.