Other mistake: Just before Julie gets a message from her mother on her blog, we see Julie typing, but she never hits the space bar.
Other mistake: In Meryl Streep's simulation of Julia Child's famous potato pancake flipping fiasco, the stove isn't turned on. In the original Julia Child "French Chef" program, copious amounts of steam and sizzle were emanating from the skillet.
Other mistake: Meryl is renowned for her accents. But in this film, her accent comes and goes, for example, when she's sitting for her second exam for cordon bleu, her accent is gone completely.
Chosen answer: It's entirely possible that she got a PO Box, which would allow her to receive goodies and keep her address private at the same time.