Incorrectly regarded as goofs
Likewise when Hans, Chewie, Rey, and Finn attack Starkiller Base from the ground they are also in a forest like on a planet not an extremely large satellite.
As made clear by the Youtube channel "New Rockstars" at 35:40 through the video "Star wars force awakens all Easter eggs and references (FULL MOVIE)", Starkiller Base is actually a weapon built into an already-existing, unknown planet, which would explain why there is mountains and trees around unlike the death star which is a fully man made satellite.
This was true only until Disney abandoned the Extended Universe as canon. Han's children were Jacen, Jaina and Anakin and Luke's son was Ben in the expanded universe. The Expanded Universe is no longer considered canon to the Star Wars universe as it applies to these movies.
It could in fact be argued that the "Ben" name was used as a nod to the now non-canon EU.