The extrasolar planetary system around HR 8799 is the first multiplanet system ever imaged . It is also , by a wide margin , the highest mass system with > 27 Jupiters of planetary mass past 25 AU . This is a remarkable system with no analogue with any other known planetary system . In the first part of this paper we investigate the nature of two faint objects imaged near the system . These objects are considerably fainter ( H=20.4 , and 21.6 mag ) and more distant ( projected separations of 612 , and 534 AU ) than the three known planetary companions b , c , and d ( 68-24 AU ) . It is possible that these two objects could be lower mass planets ( of mass \sim 5 and \sim 3 M _ { Jup } ) that have been scattered to wider orbits . We make the first direct comparison of newly reduced archival Gemini adaptive optics images to archival HST/NICMOS images . With nearly a decade between these epochs we can accurately assess the proper motion nature of each candidate companion . We find that both objects are unbound to HR 8799 and are background . We estimate that HR 8799 has no companions of H < 22 from \sim 5 - 15 ″ . Any scattered giant planets in the HR 8799 system are > 600 AU or less than 3 M _ { Jup } in mass . In the second part of this paper we carry out a search for wider common proper motion objects . While we identify no bound companions to HR 8799 , our search yields 16 objects within 1 degree in the NOMAD catalog and POSS DSS images with similar ( \pm 20 mas/yr ) proper motions to HR 8799 , three of which warrant follow-up observations .