Initial candidate screening call

So I found this job on LinkedIn, clicked apply and I remember 2 things 1 - based in my city 2 - full time permanent I then got a screening call from someone in HR and they shared a couple of fun details 1-this is actually a remote camp job 3 weeks in / 1 week out 2-this is actually a 6 month trial contract with a 'possibility' of becoming full-permanent. is this a common thing where they will just sneak in those details ? Because almost every other job posting Ive seen in these last few months were fairly straightforward re: travel, location, work hours, contract/permanent. No screening call/interview surprises. these bums are misleading me