caught its last UnSub this past February when the CBS series exited after 15 seasons. September 22 marks 15 years since its 2005 premiere, and for the first time, fans are facing a TV season without the BAU.

So, disappointed viewers, how about this? We’ve rounded up 10 trivia tidbits about the procedural and its cast. You likely know about ’s , ’s , and the  surrounding  and ’s ousters.

But do you know which 

 star was originally booked for just one episode? Which cast members played near-identical roles on ? And why Reid wore glasses all the time? Read on…

1.  was originally called  and was  less than two months before CBS announced its 2005–06 primetime lineup.

2.  (Penelope Garcia) was only slated to appear in one Season 1 episode but ended up staying for the entire run. In , Vangsness credited her longevity to her chemistry with costar 

, saying their characters had the “yummiest, delicious, coolest male/female relationship.”

3. The Season 4 episode “Memoriam” features Moore’s character, Morgan, watching 

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