One of the things I like about Lie Bullets is that sometimes they are the key to branching paths. In some debates A Lie bullet use could be in the same debate where a Truth Bullet can also be used. Thus, it creates unique dialogue transitions in these trials
I love the screen effects when the lie bullet is engaged. The shifty eyes seems to be a neat representation of how a person who's about to lie might act all shifty and nervous about it, which also ties into the gradual loss of Influence.