Burbank departures are routed differently than LAX departures. One route I saw out of BUR is:
KBUR
VNY8 - Depature procedure calls for turn to west, expecting radar vectors
GMN - Gorman VOR
GALXY - GALXY intersection
COREZ - COREZ intersection
MAKRS - MAKRS - intersection
BSR - Big Sur VOR
BSR2 - Standard Terminal Arrival Big Sur Two
KSFO
So the two things you might hear are "intercept the Gorman 142 radial" or "cleared direct CASTA." While there is a CASTA2 departure procedure from LAX, in this case, they are clearing the pilot to the point in space that is the CASTA intersection. This intersection is where the LAX Departure Procedure gets its name as it flies through this point. This point just happens to be 18 nm southeast of the Gorman VOR along the (you guessed it) 142 radial.
So "intercept the Gorman 142 radial" would be keep flying straight ahead until you hit that radial, then turn northwest (322 degrees) and fly along it, while "cleared direct CASTA" would instruct the pilot to turn and fly straight to that point in space, then make the turn northwest along the 142 radial.
Check out this link and you'll get a pretty good idea of the route:
http://skyvector.com/?ll=34.532783554161526,-118.72658302295261&chart=24&zoom=3&plan=A.K2.KBUR:F.K2.CASTA:V.K2.GMN:F.K2.GALXY:F.K2.COREZ:F.K2.MAKRS:V.K2.BSR:A.K2.KSFO