Sorry it took so long to get back to you on your ER post. I was out of town for a few days, then back, and now am working 50 hrs in the next three days.
Overall, I don't see any "Red flags" in that ad. The thing to remember is, they are making promises that they may not be able to keep. Such as which shift, or when you work, and/or charge/triage responsibilities. The bottom line is, if they have a high turn over rate, or even one similar to most other places, or even a couple call offs on one day, you could be thrown into one of those spots (i.e. triage, charge etc) Other than that it looks/sounds good