First we solve the rebuses:
(Abu - a = BU) + (Ragu - a = RGU) + (Andy - a = NDY) = BURGUNDY
(bark a->u = BURK) + E = BURKE
(cross - s = CROS) + (bike - k = BIE) = CROSBIE
DAN + (Cher - h = CER) = DANCER
(grid d->f = GRIF) + FIN = GRIFFIN
(Hart - t = HAR) + (PER sign) = HARPER
keeper - e ^ n = KEPNER
LA + PI + D + US = LAPIDUS
ONE + (nil - n = IL) = ONEIL
say ^ h = SHAY
tab ^ u = TAUB
TEN (Dyson d->n = NYSON) = TENNYSON
(web - b = WE) + (Astley - t = asley) = WEASLEY
W in KLE = WINKLE
Then we notice
BURGUNDY and WEASLEY. Both have an orange outline and both are characters with first name Ron from Anchorman: the Legend of Ron Burgundy and Harry Potter. Then we see those movies' abbreviations in the middle square and both are italic. Turns out italic is movies and not-italic is TV shows.
We find them all:
orange: Ron Burgundy (ATLOR?), Ron Weasley (HP)
green: Leslie Burke (BTT), Leslie Crosbie (TL), Leslie Lapidus (SC), Leslie Shay (CF), Leslie Winkle (TBBT)
red: April Dancer (TGFU), April Kepner (GA), April O'Neil (TMNT)
blue: Chris Griffin (FG), Chris Taub (H)
yellow: Ben Harper (MF), Ben Tennyson (B1)
Then we notice that
Ron, Leslie, April, Chris, and Ben are all characters from Parks and Recreation!
I thought that was the end but @Daniel S observes in the comments that we can go further:
let's take those characters' last names and order them by color of the rainbow:
red: April LUDGATE
orange: Ron SWANSON
yellow: Ben WYATT
green: Leslie KNOPE
blue: Chris TRAEGER
If we index into the last name by the number of times the first name appeared in the grid, we get DWYER, the surname of the same show's character Andy Dwyer.