Right after their oath, Nobunaga and his friends saw a "star" shine bright on the sky that looked like it was coming closer. Nobu commented on how great to see a star that ballsy before the "star" fell pass their heads.
Nobunaga lampshading the effectiveness of Jeanne's disguise.
Himiko essentially tricking Nobunaga into proposing to her.
Nobu: "I will take Queen Himiko of Yamato to be my wif... Huh?!"
Nobunaga struggling with the word "overheating" in episode 11
Nobu: "Over- ovah- ove- overwhat?"
Da Vinci (slowly): "Overheating"
Episode 14: Adiabatic Expansion. Especially the second time.
Episode 16: Hideyoshi and Caesar "conversation" before launch touches a little on how fans feel about Caesar.
Hideyoshi: You're the type of guy people love to hate!