Current cast member here! Hopefully I can provide some answers for everyone, either here or in a PM.
I've been with Sephora for about eight months now, and I actually opened a new store, so my experiences are a little atypical in regards to training.
First things first!
What are they looking for?
Retail experience! It doesn't need to be cosmetics retail, though that most definitely is a point in your favor. First and foremost. Sephora is a business, we want to know that you're capable of selling to clients and adding on. Barring retail experience, customer service and/or an emphasis on being a team player and a people person. Also, since the company is now moving towards online applications, please make sure that your email is appropriate. There's nothing more cringe worthy than reading some ridiculously inappropriate email address and its a surefire way for the hiring manager to reject you. Being a licensed cosmetologist or a licensed esthetician isn't a requirement, but it lends you some credibility. I personally work with about five girls who have licenses in various things. We want bubbly, personable, responsible, and drama free people.
How do you ace your interview?
For the love of god, please come dressed to impress. Hair done, makeup done, and looking good. Look put together. Nice slacks or a skirt, paired with a dressier shirt and nice shoes mean a lot. We've seen girls come in with sneakers and short shorts with last nights makeup still on to interview. Also, please be nice to the cast members in store. We do talk, and leadership does ask our opinions on candidates if we interact with them.
In my store, it's not uncommon for there to be two to three interviews. There will be an interview with either the Store Director (store manager) and/or the Specialist (assistant store manager). Sometimes they're group interviews, sometimes they're one on one. They will talk to you about Sephora, the brand, the core values, LVMH, etc. Then they will launch into the interview. They'll ask the typical "where do you see yourself in five-ten years?", "why Sephora?", "are there any restrictions on your time?" Then, they'll give you hypothetical questions, "what do you do if you saw or heard your coworker planning to call out sick in order to get out of work to do something?" (Correct answer is to tell a member of leadership, by the way.) or "what would you do if you saw a coworker steal?" (report it immediately).
Then comes the demo. If you're interviewing for a holiday position, its always a roleplay on what you would do with certain situations at the registers. If you're interviewing for a permanent position, its a tossup between registers or selling. Depends on who's doing the demo. There will be no makeup demos.
THEY DO CALL REFERENCES. PLEASE HAVE THREE OR MORE.
Preferably more than three, as then they'll have options in case someone doesn't pick up.
Final notes, from a cast member to you, please don't call the store over and over asking about where we are on hiring. Yes, it's wonderful that you're calling to check in/say thank you. But after two or three times, you're just annoying the cast and the hiring manager(s).
Best of luck!