The actress, who plays Quinn Fabray on the Fox musical series, said that while Glee has done a storyline centred around prom in past years, this season's holds more weight as many of the main characters are seniors in high school, attending the event for the final time.
Talking to MTV News, Agron explained: "We had [director] Eric Stoltz back with us, who directed last year's - he's really fun and really knows teenage life.
"That prom episode last year really felt like Pretty in Pink and Sixteen Candles - it had that awesome touch to it."
Asked how this year's prom will differ, Agron continued: "It wasn't our last year of school [last year] and there wasn't really that thought process like that this might be one of the last moments together, so that's all really incorporated in this year's.
"There's a fun theme to it; there's some really surprising moments. I think people will like it."
The 25-year-old added that she has positive memories of her own prom, adding: "We went with all of our friends, so it wasn't really so much of 'let's have a romantic date'.
"There were about 25 of us who just said, 'OK, pick somebody'. And we all went in a bus and we all had dinner before. It was just really fun and a lot of dancing."
Glee's prom episode airs tonight (May 8) at 8/7c on Fox.