Jenna Ushkowitz did do the stunt of falling in to the mall fountain. There were, however, two stunt doubles who also fell in to the fountain: PeiPei Alena Yuan and Ming Qiu. For the episode, footage of all three women falling was used.
"Maniac" from Flashdance is on the car radio as Tina and Rachel drive to Oberlin. The song they sing together later is also from Flashdance, "What a Feeling."
In Tina's alternate reality, she switches places with Rachel. Finn switches with Kurt, Puck switches with Blaine, Artie switches with Santana, Brittany switches with Mercedes, Will switches with Sue, Quinn switches with Sugar, Sam switches with Rory, and Joe switches with Mike.
Blaine makes the remark, "Aren't props cheesy?" upon examining the welding helmet; however, Throat Explosion uses masks in their costumes at Nationals the following year for "Mr. Roboto," to great advantage.
The printed set list Will and Sue preview lists the "Dashboard" performers as "Finn, Rachel, Puck, Artie, Tina, Mike, Santana, Brittany, Sam, Mercedes, Kurt, Blaine, New Directions." Quinn, Joe, Sugar, and Rory are not listed by name.