When Karen drops the tape box the sound it makes sounds like a tape is still in it, but the tape is still in the VCR.
When Grace and Will are eating pizza right at the beginning Grace has a medium sized piece of pizza when she says "It's also wrong" and then says she needs to go the piece of pizza has grown and is folded slightly in her hand. There is a quick kiss between her and Will before she drops the crust of a piece of pizza into the box. But she had a large piece in her hand just before.
18th minute. Jack has a pepper shaker in his hand at one moment and suddenly is gone.
When Grace plays the tape of "Next to Godliness" for Karen for the first time, Karen coughs into her compact and spills powder everywhere, including her desk. In the shot immediately following, not only is the compact gone, but so is all the powder.
Grace, speaking to the delivery man, attempts to emulate Julia Roberts in Notting Hill, when she says, "I'm just a girl, standing in front of a boy, asking him to love me." Anna Scott, the character, actually said, "...to love her."