Lancer's dislike of dogs can be seen as a shout-out to how his Heroic Spirit died.
To South Park of all things, copying the infamous They Killed Kenny lines: "Lancer died!" "YOU BASTARDS!"note A popular fansub has "You aren't human" instead. However, the exact Japanese quote used in both this show and the dub of South Park is "kono hitodenashi!" ("この人でなし!") which translated means "these brutes!", ergo, "you bastards!" (which can be singular in context). "You aren't human" is just a poor translation, erroneously interpreting the line as "kono hito de nashi", but "hitodenashi" is supposed to be one word.
Season 1
Episode 1: At the end of the quiz show, Berserker "dies" standing with his right hand up in the air just like Raoh.
Taiga's movement freezes at the end of second episode in the middle of a Shoryuken.
To Tokimeki Memorial in the fourth episode, when the affection statuses of each of Shiki and Shirou's respective haremettes are shown with blinking bombs.
In episode 5 Illya is playing games like Tekkyaku, GiltyBlood and another one with a Super Saiyan on the cover. She also has what appears to be a pinkWii.
The finale of White Princess Phantasmoon is a reference to the final battle in REIDEEN. Also, the enemy is Tamami from Mahoraba.
Episode 10: Brainwash Detective Hisui always opens up with a gate opening and the title of the episode, which is a reference to Case Closed.
Episode 11
The whole episode is a shout-out to the Final Destination franchise, with Lancer trying to avoid all his deaths and failing anyhow. Complete with custom credits!
The end credits use the same "flowing blood" style as the opening credits of the 2004 version of Dawn of the Dead (2004).
The way he averts his death by car is by saving a kid who was playing ball too close to the street. Basically, a reversal of the first chapter/episode of YuYu Hakusho.
The Warning screens for Illya and Akiha in episode 12 are right out of the Darius games. And does the close-up of Sakura's face imply she has a Persona?
One of the movie tickets that Shiki has for Arc in episode 12 is for Michael Jackson's This is It!
The stages in the Tempest: Illya's Castle special were all based on challenges found in the Takeshi's CastleGame Show. Yes, even the one with the giant spinning mushrooms.
Archie would be impressed by Shiro going as far as three (okay, that was technically even four) dates in one episode.
Note as well the similarities between Rin and Veronica, as well as Saber/Sakura and Betty.