Marti Noxon said about the episode Entropy: “The Spike-Anya thing really worked. Those two characters have a real chemistry together and it’s fun to say, ‘Oh, that works.’ Also we were just trying to put the knife in a little bit deeper.”

Buffy and Dawn go shopping in Entropy, as Buffy tries to make up for Dawn for nearly killing her. The scene was filmed on the Santa Monica promenade in L.A. It’s near Venice Beach.

Xander’s old feelings for Buffy come out in the episode Entropy, when he discovers that Buffy has been sleeping with Spike. His feelings for the Slayer haven’t been mentioned for a while, but he was obsessed with her in the first couple of seasons.

The following is a stage direction from the script for Normal Again: “The camera pulls back slowly, down the hall. Leaving the doctor and Buffy’s parents helpless, and Buffy lost in a distant delusion.”

Anya returns to Sunnydale in Entropy as a vengeance demon. Halfrek reminds her that vengeance demons are unable to seek vengeance for themselves.

The following lines were deleted from the episode Entropy:
Willow: “Can’t help thinking maybe you were closer than you thought that day you went out with the addresses.”
Buffy: “And they sent the Psycho Demon to interrupt me.”
and
Buffy: “And, you know, maybe in a couple of months they’ll let us …

In Normal Again, Buffy asks Willow why she is all, “home, hearth, and DSL anyway?” DSL, which stands for Digital Subscriber Line, is American broadband Internet.

Andrew says in Normal Again, “I still say we’re gonna need at least eight other men to pull this off.” He’s referring to the movie Ocean’s Eleven in which 11 people pull off a heist.

In Normal Again, Willow refers to Buffy as, “Cuckoo’s Nest”. This is a reference to the book about a mental asylum One Flew Over The Cuckoo’s Nest by Ken Kesey. It was turned into a movie, starring Jack Nicholson.
In the Angel episode Damage, Harmony says, “A girl over in the …

In The Puppet Show, Xander holds up Sid the Dummy and says, “Redrum, Redrum”. This was an ad lib by Nicholas Brendon.

After the fiasco of their non-wedding in Hell’s Bells, Anya is nowhere to be seen in Normal Again. Xander returns to Sunnydale and says that Anya’s things are gone and there’s a closed sign in the Magic box.

In Normal Again, Buffy confesses to Willow that her parents put her into a clinic after she discovered she was the Slayer. She said they panicked and didn’t believe her, and felt there was something psychologically wrong with her. It seems strange, then, that Joyce didn’t mention anything about this …

In Normal Again, the doctor in Buffy’s hallucinations explains a couple key events of the past few years. He tells Buffy that she had a ‘momentary awakening’ during the summer and it was her friends who pulled her back into the delusion. This is a reference to Buffy’s death and …

After her mother died, Dawn started stealing things to try and get attention. She took some of Anya’s earrings in Intervention, a necklace in All the Way and an amulet in Once More, With Feeling. She told Justin in All the Way that “I haven’t paid for lipstick since forever” …

Lorraine Ross became the manager of the Doublemeat Palace after Manny was killed, after working with the company for five years. She explained to Buffy (in complete confidence) that the Doublemeat meat was actually vegetables. Lorraine allowed Buffy to have her job back after the wig-lady debacle. In Normal Again, …