In an interview with Howard Stern on Monday, Seth Rogen said Katherine Heigl’s past comments about Knocked Up caught him off-guard. It's not the first time he's been asked about it, and not the first time Hollywood has said Heigl is difficult to work with. However, her remarks are from quite a long time ago. In a 2008 story for Vanity Fair, when asked about it directly, Heigl said that the movie was a "little sexist," and:
...paints the women as shrews, as humorless and uptight, and it paints the men as lovable, goofy, fun-loving guys. It exaggerated the characters, and I had a hard time with it, on some days. I’m playing such a bitch; why is she being such a killjoy? Why is this how you’re portraying women?
Rogen stressed that he enjoyed working with Heigl, and said he felt Judd Apatow's process would've allowed her to speak up if she didn't like her character's direction during filming:
I thought we had a great dynamic, people seemed to like it, we were funny together, I was having a really good time, and then when I heard afterwards that she didn’t like it, that she seemed to not like the process, and she did not like the end product either. I think when that happens – also your trust feels somewhat betrayed. We have a very open process. We’re like, ‘You have the ability to say anything at any moment. I don’t like how I’m coming across here.’
It should be noted that Heigl didn't bring it up herself, and also said this about her role and the movie in her Vanity Fair interview:
Ninety-eight percent of the time it was an amazing experience, but it was hard for me to love the movie.
Seems like the whole thing was blown out of proportion. And if Howard Stern wants to kick a hornet's nest with Heigl or Rogen, he could bring up any number of their other questionable films, including 27 Dresses and The Green Hornet, respectively.