When Chloe burned the disc the computer screen reads 'burning to DVD', but when she takes the disc out its dye is dark blue, meaning it was in fact a CD recordable, but the disc handed over to Lex is a DVD recordable as its dye is purple.
Black Canary, at least in this universe, does not have invulnerability or superhuman strength. Kicking Clark (and getting knocked back from the impact) should've shattered her entire leg. Instead, a few seconds later, she's shown to walk away like nothing happened.