MULTIPLE CABIN ATTENDANT RPT; B757; SFO-MIA. CABIN ATTENDANT FOUND EXIT PLACARD ABOVE DOOR 2L HAD FALLEN IN BTWN INSIDE AND OUTSIDE OF DOOR; CAUSING AIR LEAK. DIVERT TO DFW.

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REGARDING MECHANICAL SIT; PLASTIC EXIT SIGN ABOVE 2L EXIT DOOR HAD SLIPPED DOWN INTO THE CLOSED DOOR. AFTER TKOF; APPROX A FEW MINS INTO OUR CLB; I NOTICED 2 THINGS: 1) THE EXIT SIGN ABOVE 2L HAD SLIPPED DOWN INTO THE CLOSED DOOR. PART OF THE SIGN WAS OUTSIDE THE DOOR AND A PART OF IT WAS STILL INSIDE. 2) A LOUD AIR LEAK SOUND WAS COMING FROM THE DOOR. I IMMEDIATELY TOLD THE #5 FLT ATTENDANT ABOUT THE SIT -- THAT THERE APPEARED TO BE AN AIR LEAK. I GOT UP TO ASSESS THE SIT AND THEN ASKED HIM TO DO THE SAME. I IMMEDIATELY WENT INTO THE COCKPIT TO INFORM THEM OF THE SIT BEFORE WE GOT ANY HIGHER. (MY FIRST QUICK ASSESSMENT WAS THAT IT LOOKED LIKE A PLACARD EXIT SIGN HAD SLIPPED INTO THE OUTSIDE PART OF THE DOOR AND THAT THERE WAS AN AIR LEAK. I ASKED THE CAPT AND FO IF WE COULD STAY LOW UNTIL WE FURTHER ASSESSED THE SIT. THE CAPT GOT ON THE RADIO IMMEDIATELY TO PASS ALONG THE INFO. I WENT BACK TO ASSESS THE SIT FURTHER. THAT'S WHEN I AND THE #5 FLT ATTENDANT DETERMINED THAT IT WAS DEFINITELY THE EXIT SIGN DOWN INSIDE THE DOOR AND THAT IT WAS A CURVED PLASTIC PIECE (APPROX 1/8 INCH THICK). I TOLD THE CAPT IMMEDIATELY. HE WAS GOING TO TRY TO LAND IN SACRAMENTO OR LAS VEGAS; AND INSTEAD MADE THE DECISION (WITH ADVICE AND INSTRUCTION FROM OTHER SOURCES) TO LAND IN DALLAS. I KEPT THE CAPT INFORMED. THE NOISE WAS FAIRLY LOUD AND WHISTLED AFTER WE WENT ABOVE 15000 FT. WE STAYED AROUND FL200 AS FAR AS I KNOW. THE CAPT ALSO SLOWED US DOWN APPROX 100 MI SLOWER PER HR (HE TOLD ME). WE LANDED IN DALLAS. MECHS OPENED THE DOOR. THE SIGN FELL OUT. THEY RETRIEVED IT; AND AS FAR AS I KNOW; RESHAPED IT AND PUT IT BACK IN PLACE. WE LEFT DALLAS FOR MIAMI SOON AFTERWARDS. SUPPLEMENTAL INFO FROM ACN 484797: WE KEPT MONITORING THE SIT; MOVED PAX FROM DOOR AREA.