Just FWIW, last year my older DD's teacher was very convinced she had Asperger's and that we were in denial about it. OTOH, we've had her evaluated a couple times and her therapists (one of whom runs a social skills group for children with Aspergers) does not think she has Aspergers. So teachers may be knowledgeable, but sometimes they enough to just be a little dangerous.
Also, as PP have noted, it can be difficult when kids are young to sort out various things. My older DD is quite quirky with a broad variety of issues that can be seen through the lens of Aspergers, ADHD, SPD, anxiety, etc. They feel right now that the best diagnosis for her, and the one we took to the school to get a 504, is anxiety. Many of these conditions can overlap and the picture does not always become clear until children get older and school and the social landscape becomes more complicated.
She is taking a social skills class right now and we are finding it very, very helpful for her.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)