When was it shot?

On the commentary, the girl who played Jessica (Liliana Mumy) mentions that she celebrated her 9th birthday during the shoot, which was April 16th 2003. On the clapboard during a couple behind the scenes featurettes, it appears to say 5/13/03, and another said 4/15/03. So was it shot during March to about June? I assume that they were doing casting during the summer and fall of 2002. Funny thing is, I can remember exactly what I was doing on those days. lol. On April 15th and 16th, 2003, I came down with this bad cold during spring break. On May 13th 2003, my cousin accidentally smashed his fist through our glass storm door and had to get rushed to the emergency room.

Like the proverbial cheese, I stand alone. Even while seated.