Here is what someone had to say on their forum about the shower scene:
Would love if this were true!! Thank you to my mystery poster...Thank you very much!!!
"They were filming yesterday in Ambridge. One of the set managers came into the Bed, Bath, and Beyond in Robinson to purchase 7 shower curtains for the movie. He said Heigl will be handcuffed to a shower rod at some time in the movie and needed several in case they ripped."