From your response it appears to me one should stick to an employer who is sponsoring your PNP. If any other employer wish to hire me from the same province would it start the PR process from the beginning or since it is same province; it could continue normally.
You should ask the PNP in your province about the details but from what I was told by AINP some time ago, if they hear that you are no longer working for the employer who sponsored you, they will cancel your application and you have to start again from scratch, new employer has to sponsor you for PNP, you need to get the nomination again, apply for PR again etc.
Also if I happen to get married meanwhile, would PNP status allows dependent to work legally?
If you get married, you must ask the PNP to add your new spouse to your PNP application or if you are already at the stage of applying for PR after PNP nomination, you have to add your spouse to your PR application. The PNP itself will not allow your spouse to work but you being in Canada on a skilled work permit will allow the spouse to apply for an open work permit.