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The song Hinagiku sings at her surprise birthday party is 'A Cruel Angel's Thesis' which is the opening song for the anime 'Evangelion'
Upon finding out the anime studio doesn't have voice actors, Izumi Segawa says "And here I though I would meet Ms Yagahi!", whom is the none other than the voice actress of Izumi.
One of the terrorists wears a mask nearly identical to Nagi's when she disguised herself as Mask the Money.
The two children featured in this episodes are spin offs ofIkkiandShunfrom the anime 'Seiya'
When Hayate says that he's only interested in 2d girls, theres a band that shows up. That band is from The Melancholy of Haruhi Suzumiya when she participated in a band.
Ginta and Dorothy from MAR are clapping along with a group of people later on in the episode.
When Hayate falls down the subway stairs on his bicycle, ironically, there is a sign that says "Use Caution on Bicycles" that has a picture of a person on a bicycle falling down the stairs.