Sniper himself earlier, while talking to Delenn about pity (see below).
Bilingual Backfire: Held hostage, Delenn and Lenann quietly start assessing the situation and planning an escape strategy in Minbari, only for one of the captors to interrupt them. He doesn't actually say anything in Minbari, but he makes it clear that he understood exactly what was being said.
Continuity Nod: Garibaldi's spoken authorization code for certain high-level computer functions is "Peekaboo".
Embarrassing Password: Garibaldi uses the spoken security code "Peekaboo" for certain high-level computer functions. (By comparison, Sheridan and Ivanova use "Obsidian" and "Griffin", respectively.) His justification: "Hey, would you have guessed it?"
I Surrender, Suckers: Variant. Sheridan makes Nightwatch think the Minbari have pulled out... then fakes a reactor leak to force them into the open.
Love Confession: This is the episode where Sheridan comes clean with his feelings for Delenn.
Sheridan: ...I can no longer imagine my world without you in it. I don't know when or how it happened, but I'm glad it did.
Two others come out, though one is towards a deceased character (Ivanova confesses she thinks she loved Talia) and another not directly to the object of affection because it's not meant to be (Lennier confesses he loves Delenn as his "tell a secret" rebirth ritual to Marcus)
Rage Breaking Point: Marcus mentions in passing that his instructors warned him that he was repressing a great deal of anger. After beating a large room full of thugs senseless, he doesn't feel repressed anymore.
Alternately, his Ranger training...either way...
Real Life Writes the Plot: Jerry Doyle's arm actually did get broken while filming the previous episode's fight scene. This happened after most of the dialogue in the script was finalized, and Sparky's "broken arm" line was in there before Doyle actually broke his arm.
Straczyinski is no longer allowed to mention the body parts of crew members, after this and the Ivanova incident.
Reality Is Unrealistic: The Night Watch leader's scar got a lot of complaints for looking fake. JMS responded that it's the real thing, as the actor got it protecting a woman from being raped.