One prominent player who comes to mind is running back Robert Edwards. His talent has been pretty obvious to the Dolphins throughout training camp, but he has yet to show he can handle the rigors of an NFL season.
If he can't get through Saturday night's game or has problems on Sunday, he would be in clear danger of not making the final roster.
Because the Dolphins want to see if he can withstand punishment, look for Edwards to get plenty of work in the second half against the Texans.
Another area that needs to be closely watched is the safety position. Coach Dave Wannstedt commented this week how the Dolphins have great depth at this spot.
The problem with that is that a good player is going to wind up being let go. Starters Brock Marion and Arturo Freeman, as well as top backup Shawn Wooden are locks to make the team, but after that there's a great battle going on between Scott McGarrahan, Trent Gamble and Jason Moore.
Those three are fighting for one spot, possibly two.
There's also major competition along the offensive line, with Leon Searcy, Brent Smith, Marcus Spriggs and Troy Andrew battling for the two or three available backup spots.
Finally, young wide receivers Albert Johnson and Robert Baker are trying to unseat Jeff Ogden for the fifth spot, although the Dolphins could wind up keeping six wideouts.
Among the players who don't figure to last past the first cut — unless they do something incredible against Houston — are P Casey Roussel, DT James Atkins, DE Rod Kelly, T Corey Mitchell, T Anthony Cesario, T Greg Jerman, LB Shannon Wadley, LB Kevin Rollins, TE Shawn Draper, WR Ronney Daniels, WR Sulecio Sanford and QB Zak Kustok.