In the Investigation Discovery documentary series about the alleged sexual abuse, racism and sexism that took place on several Nickelodeon series during early ’90s and 2000s, child stars accused network producers and crew members of child sexualization and fat-shaming, female writers say they were forced to split their salaries and act out sexually suggestive scenes in the writers room, and former child actor Drake Bell detailed sexual abuse at the hands of production assistant Brian Peck.

“This series investigates the abuses experienced by children from the adults they were expected to trust. Viewer discretion is advised,” is the warning that pops up at the beginning of each episode of “Quiet on Set,” cautioning viewers ahead of the horrific allegations.

The series started off with a peek into Nickelodeon executive Dan Schneider’s life going from an awkward Memphis teen (who was reported to have attended his father’s alma mater Harvard University though he never actually went) to landing a role on “Head of the Class,” and how that role kickstarted his career in children’s television. And while the series notes Schneider launched the professional careers of stars like Kenan Thompson, Ariana Grande, Amanda Bynes and more, it spotlights the alleged sexually suggestive scenes he often placed many child stars in.

The series made its debut over the course of two nights on ID, on March 17 and 18. Here are some of the most shocking takeaways from the series.

Schneider has denied many of the claims made by interviewees in the show.

Leon Frierson details having to wear a “penis”-inspired suit

Former child actors Leon Frierson (“All That” Season 4-6) and Katrina Johnson (“All That,” age 10-16), both said staying close to and keeping the attention of Dan Schneider was key if an actor wanted to further their career. At one point, Schneider was Johnson’s mentor, though that dwindled after it appeared she’d been replaced by rising star Amanda Bynes, and Frierson said he always tried to be a “trooper” on set despite feeling uncomfortable when asked to do certain sketches.

“On ‘All That,’ what really made me feel the most uncomfortable were the leotards. I was just a growing boy trying to fit into my body and it was just out there for everyone to kind of look at and judge me, or, I just felt very exposed,” Frierson said. “One week we get a new script, there’s a character for me on ‘All That’ named Nose Boy. Naturally, I’m in a superhero costume, which is just tights and underwear. What was different about this, they gave me a prosthetic nose, an enlarged nose, and they put this same nose on the costume. You can’t help but notice that it looks like penis and testicles on my shoulders.” In the bit, when Nose Boy sneezed, a clear white substance shot through his nose.

As for Johnson, she remembered the time when producers allegedly contacted her parents because they felt she put on too much weight.

“One day, the producers called my house and spoke to my parents and said, ‘Hey, Katrina’s getting too fat. We already have a fat one. She can’t be the fat one,’” Johnson said. The documentary then showed a photo of Johnson pictured with longtime actress Lori Beth Denberg. Johnson said her parents told producers that she was in dance classes six hours a day and there was nothing more they could do about her weight. However, when Johnson hit puberty, she said Nickelodeon producers weren’t pleased with how she matured and she was “edged out” by a younger version of her, Amanda Bynes.

Amanda Bynes’ relationship with Schneider and why “working for Dan was like being in an abusive relationship”

“Quiet On Set” broke down the history of Amanda Brynes’ rise to fame on the show going from “Laugh Factory” child comedian prodigy to “All That” star and then onto one of the youngest female talents to have her own self-titled TV series in “The Amanda Show” — which Schneider created and produced. It also laid out the immense amount of pressure her father put on her, Bynes’ controversial relationship with Schneider and peeled back the curtains of how the female writers on the show were subject to sexual harassment and gender discrimination.

Surprising allusion from Woody Allen! Surprising allusion from Woody Allen!

Frierson said that kids and parents were supposed to stay together at all times and go to school on set, but there were times when Bynes was “just missing” or was instead pitching ideas and writing with Schneider, which was approved by Bynes’ father.

“I think Amanda’s dad kind of treated her like a wind up doll. She had, really, a lot of pressure and high expectations from him,”