1. Miller's three gang members — including his younger brother Ben (Sheb Wooley of The Purple People Eater and Rawhide fame) — wait for him at the station.
米勒的三个团伙成员 - 包括他的弟弟本（出演过The Purple People Eater and Rawhide fame 的Sheb Wooley）- 正在车站等候他
>>I don't see any problem with your translation.
2. Miller had been sentenced to hang, but was pardoned on an unspecified legal technicality.
米勒曾被判处绞刑，但因在某个法侓上的技术问题而被赦免
>>legal technicality - 法侓上技术细节
"Legal technicality" usually means that a legal procedural rule (usually of a minor nature) prevents justice being done.
也就是说米勒获得赦免是因为钻了某个法律技术细节上的漏洞
