The Sony Animation technicians developed a new tool called Shapers that permitted the animators to reshape the character models, allowing for stronger poses and silhouettes and subtle distortions (squash and stretch, smears, etc.) typical of traditional, hand-drawn animation.
This was Sony's 11th number one opening movie of 2006. It performed particularly well at IMAX theaters where it took in about $1.4 million. This averages about $22,000 per screen versus $6,000 for conventional theaters.
Based on how not so well this film did, it's sequels Open Season 2 (2008) and Open Season 3 (2010) were not released theatrically, instead being released straight-to-dvd, which both only took 2 years to make, with those 2 being Sony Animation's only films to not be released theatrically.