How come Cassandra wasn't in the Tangled wedding short. Did the King clear Eugene of all his past crimes when he returned Rapunzel back to Corona? Are there citizens that still hate Eugene for his past crimes?
We don’t have any in story information yet as to why Cassandra isn’t at the wedding, but the meta reasons (as in, the reason from production standpoint), is that Tangled the Series and Tangled Ever After (the wedding short) are not produced by the same individual people. Cassandra didn’t exist in anyone’s imagination when they made the short.
We can only assume Eugene was pardoned for his crimes. After all, his absolute biggest crime (stealing the crown) was negated by him not only returning the crown, but bringing back the Lost Princess. And he’s allowed to live in the palace (albeit in the servants’ wing), so I sincerely doubt he’s still wanted in a criminal sense. This hasn’t been addressed directly in the story, however.
There are definitely citizens who still hate Eugene for his crimes. He’s actually pretty disliked, all over, and when he tried to get a legitimate job, the one thing he was good at (being a cobbler), he was turned down for, because Feldspar recognized him as someone who had stolen from him in the past.