Actually this question can be answered from various perspectives. According to physics, both of stiffness and rigidity are a lot different from each other. From daily usage point of view, Rigid 1. An iron rod is Rigid Stiff 1. My muscles have become stiff after an unusually long exercise. 2. The door hinge has become stiff. May be we should think of applying some grease. I think you can make out the difference from the above examples. Rigid is something, that is not bendable under normal circumstances. And stiff is usually used for temporary states. Also, you can use "rigid" for describing the mentality of a person. For instance, "He has got a rigid mentality.

I think you can also say furnish.

Based on the answer provided above by Mr.Alan, I came to know that this is actually a dialogue from "World War Z". Even I haven't watched the movie. But usually, you can take the movie dialogues with a pinch of salt, especially when the scene is emotional, melodramatic, in the midst of an action sequence etc because in such scenes, the main aim of the character is to convey the meaning and thus hardly gives any priority to grammar.

Actually Help me out is a short form for, Help me out of this *bad situation*!! I think it will clear the confusion for you now.

Help me out!!

Certainly not formal. But still can be used at times even during formal conversations especially when you have to ask lot of questions like [i] How does this work? [/i] or [i] How do you get that task done? [/i] etc.

You need not make it that complicated!! You can just say, Are you going to the village? or Are you about to go to the village?

Stop Lying - Appadalu cheppadam aapandi How do you know it was there - Adi akkada vundi ani niku ela telusu