Cute episode.
Jimmy's easy access to the super secretive and supposedly secure DEO base is pretty amusing.
And at the rate that Maggie goes through girlfriends, I hope that Alex doesn't end up with a broken heart.
I wish we knew more about Daxam and Mon El's life there so that it was easier to understand Mon El's impressions of Earth. He has no trouble with most aspects, but a telephone confuses him?
I'll continue to believe that he's not actually from Daxam, but rather he's the TV version of Superboy (half Superman and half Lex Luther) who was created by CADMUS as a mole in the DEO and to manipulate him to do evil to ruin the reputation of aliens if necessary. Which would at least help to explain his complete and easy acceptance of the destruction of his planet, including the death of his lover / boss / prince.
There were plenty of nice, funny episodes, including MANY of Kara's facial expressions. Even Jimmy was somewhat tolerable, although I wish they'd give a little more time to his motivation. As others have noted, it would be interesting is his backstory included him hulking up and learning karate because he felt so inferior compared to Superman.
I hope that they don't force a Kara and Mon El relationship. They work really well as squabbling siblings, with a nice, natural and platonic chemistry.