Corrected entry: In the mummy episode, Juliet states that sunlight kills her. However, in the episode before that (Three Monsters), she is shown walking into the sub shop with a calzone box during the day.
Corrected entry: In the episode "You Muse, You Lose", Alex's new boyfriend Mason is obsessed with drawing her. When he is drawing her with chalk on the street outside Alex's home/substation, she and her dad are watching him. She decides to go down to him to break the Muse spell. When she leaves the window it takes her about 3 seconds to get outside. This is impossible with two lots of spiral stairs to get down.
Correction: Remember, she's a wizard, she could have simply flashed down the stairs.
Correction: In "Wizards vs. Vampires: Tasty Bites" Harper talks to Juliet about how she's outside during the day without an umbrella because it's cloudy. Meaning that it's only direct sunlight that will harm Juliet.