Suicide Squad: 30 Easter Eggs & References You Must See
7. The Window References
When Harley breaks into the shop window to steal a handbag during the escalation of the mission (to the annoyance of Rick Flag), the one she does it from is covered in symbolism.
The clothes on the mannequin in said window are emblazoned with the Latin phrase "si vis pacem para bellum" - or "if you want peace, prepare for war" in English. Pretty much the entire raison d'etre of the Skwad.
Deadshot then goes to the next window to look at kids clothes/toys to remember his daughter and the display has a gigantic smiley. It's so big, it's almost like they didn't think you'd get the Watchmen "who watches the watchmen" reference...