By: Addison Wylie If The Guilt Trip does anything right from beginning to end, it’s the casting.  Not only do Seth Rogen and Barbra Streisand play off one another well, but they make a very convincing mother-son team. It’s easy to believe Rogen as an embarrassed hard worker who tries to separate himself from his overbearing mother, and Streisand takes hold of that smothering role with great effect.  She’s irritating at times, but that just…