The Wolkenritter's introduction to Hayate. Namely, after the Book of Darkness summons them, Vita discovers that their new mistress has fainted.
And to top it off, after they take Hayate to the hospital, she and the Wolkenritter make up a quick excuse as to their situation; the Wolkenritter are Hayate's relatives who came from her faraway native country to celebrate her birthday and came in costume to surprise her. Seeing Zafira's ears twitch gave off a couple more chuckles.
The re-entering Eyecatch in episode 6 was of Nanoha dreaming that she was eating steamed yams. And then we find out that she's just dreaming and what she's "munching" on is Yunno (ferret form, of course).
Fate trying to get a cellphone. Nanoha, Alisa, and Suzuka start going on lengths about why she would want various features on a cellphone. Fate ends up getting a notepad.note This was only in the TV version. The DVD release changed it to her getting the same model as Nanoha.
Vita accuses the TSAB (and by extension Nanoha) of being extremely untrustworthy. Nanoha's response? "I'm not from the Administration Bureau. I'm just a citizen collaborator." Right. Because that sounds so much better.
According to the Movie a la Carte manga, the Book of Darkness doesn't actually float. Rather, Reinforce is holding up while invisible. And she trips, leaving Hayate to wonder how a flying magical tome of untold power manages to fall down.
In a later chapter, when Hayate and Fate are trapped in their Book of Darkness induced dreams they realize that something is wrong... they haven't made their Christmas Cards yet. Cue Reinforce trying to properly write kanji while Dream Linith and Precia try to make Japanese paper (first traditionally, and then with SCIENCE!)
Raising Heart's comment on their Belkan Cartridge upgrade in the movie.
Raising Heart: Pretty chic, isn't it?
The Movie 2nd A's commentary
How the Wolkenritter introduce themselves, particularly Zafira.
Lutecia lampshades how she and Arf sound so similar. Then she starts to imitate her voice, much to Zafira and Fate's surprise.
Though, it's more a Tear Jerker. The five children start to cry during the scene where Vita and Signum hunt Linker Cores from monsters, because of their reason to save Hayate. Then Agito asks Nanoha to do something, but Nanoha and Fate start crying, too, because they make the children cry with this movie.