MacBook Pro with retina display external monitor connections Is it possible to connect two external monitors to a Retina MacBook Pro without using Thunderbolt displays?

For example, one connected with HDMI and another using Apple's DVI connector and also use the screen on the laptop.
Yes, that should definitely be possible, as both Thunderbolt ports are also mini DisplayPort ports and the other would be connected via HDMI.

See also this answer: https://apple.stackexchange.com/a/54306/14994