Many of the skits are very humorous, although there's no option to watch them again, which is quite a shame. For example, the skits that take place at specific times at Shelly's house are particularly amusing, if not for the conversations themselves, then for what topic the skit browsed:
L'Arc is not amused. note For the record, they are currently dressed as clowns, forced into it by Shelly.
A lot of L'Arc's Tsundere moments, particularly during the skits, are good for a few laughs, such as when Serge or Leslie tease him, or this ending line to one skit, towards Rastan trying to reassure him about his reputation as Lagoon the Cursed:
L'Arc: What is it with you guys being so uncharacteristically worried about me all the time?!
Some of the side quests towards the end of the game can be rather amusing, due to being more plot/character-oriented than the typical "collect a certain number of drops", etc. quests. Examples include the heavy implication that Serge finds porn at one point, or Serge gambling away all of his money at the casino while the rest of the party is entirely unsympathetic.
In the final dungeon, the party gets separated, with L'Arc having to regather them by one by one, ending with Serge. Not only is most of the group notably unconcerned, L'Arc and Ryfia have a moment after finding him... while Serge is unimpressed with the lack of attention.
Serge: Sorry to break up the moment, but I AM back in the group now, just so you know!