That wouldn't surprise me to find out. I've seen a lot of shows that use Mac laptops (e.g. How I Met Your Mother), but the logo is always covered. I guess the laptops look nice, but they don't want to give free advertising to Apple.
This is strictly my opinion speaking, but the Macbook looks like the "default" laptop. Much like how the "default" video game controller was the old school NES controller (but probably has since been replaced with the ps2/3 dualshock).
