Wow! You are right! That is definately Orion:

http://farm4.static.flickr.com/3156/...c90b486b_o.jpg

Later, when Cally goes to the airlock she looks out the window and see this:

http://farm3.static.flickr.com/2116/...bba0cc53_o.jpg

Does anybody recognize that as a constellation (as seen from Earth)?

EDIT:
About the airlock incident... Cally goes to the airlock where she overrides the safeties with Tyrol's key. As I see it, Cally intends to kill herself and/or her child. When Tori arrives, Cally locks her into the airlock with her. Tori knocks out Cally and gets rid of the obvious threat to her life (as well as a witness). I think her primary motivation is simply self preservation, more than an evil "by your command" cylon act.