Dependent origination arising of feeling I'm just reading about dependent origination and wonder how different individuals have different feeling even if contact is the same?

It only makes sense if condition for arising of feeling is not only just phassa (contact). 

Let's say if I hear a sound and feels unpleasant. Others might not necessarily feel the same. So what would be the other factors in arising of feeling?
"From phassa as a condition, vedanā arises. With the absense of phassa, vedanā does not come to be" (paraphrasing).

The above is not quite a description of a detailed cognitive chronological process for the arising of a specific pleasant/unpleasant feeling. It declares on what basis something (eg. vedanā; any vedanā) comes to be, and on what basis something does not.

It's also strange to see it as "two people experiencing the same contact", which may also lead one to think that two people experienced the same experience (which they never do).

A summary of a not-quite chronological cognitive process is described in the suttas as originating in phassa (from external sense base, internal sense base and corresponding viññāṇa) going through sañña and vedanā. A detailed analysis is elaborated in abhidhamma (image from Abhidhammatha Sangaha):