Why does Laura Harris put on such a horribleDixie accent that even a New Yorker would find painfully fake? Because her character is an alien, and is thus not a native speaker of the accent! Indeed, in the original version of the script, she drops her accent just before The Reveal.
Delilah's Clark Kenting to avoid being detected by the aliens should never have worked... and it didn't. In the scene at Zeke's house not long after, she's revealed to have been infected. Her Clark Kenting worked about as well as it would have in Real Life.
