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.
米勒的三個團夥成員 - 包括他的弟弟本（出演過The Purple People Eater and Rawhide fame 的Sheb Wooley）- 正在車站等候他
>>I don't see any problem with your translation.
2. Miller had been sentenced to hang, but was pardoned on an unspecified legal technicality.
米勒曾被判處絞刑，但因在某個法侓上的技術問題而被赦免
>>legal technicality - 法侓上技術細節
"Legal technicality" usually means that a legal procedural rule (usually of a minor nature) prevents justice being done.
也就是說米勒獲得赦免是因為鑽了某個法律技術細節上的漏洞
