Possibly felt reports reported on the wrong quake. There was a 3.9 about 4-1/2 hours later out by Hemet/Idyllwild, which I felt weakly (more like heard).

http://www.data.scec.org/recenteqs/Quakes/ci15237073.html

On the current felt reports list (as of this writing) by distance, I'd say the first four are likely misreports.

CA Long Beach 90805 2 1 2378 33.86°N 118.18°W
CA Blue Jay 92317 2 1 2376 34.25°N 117.21°W
CA Burbank 91504 2 1 2337 34.20°N 118.33°W
NV Las Vegas 89122 2 1 2288 36.11°N 115.04°W

Too bad we can't see the report times.

Brian