Why can´t i recognize odd things in my dreams???

[glueinmyshoe472]

i´ve never actually done a reality check in one of my dreams before but there are soooo many odd things that i assume that i would´ve recognized by now that at least one of them were odd enough to see that i was dreaming but i haven´t. whats with this? and should i focus more on getting myself to do a reality check in a dream or just keep trying to notice the odd things?