There's a definite "homely" and familiar feel to your characters. They develop well. It's not a task to relate, I feel as though I could bump into these guys in a coffee shop. That's a beautiful accomplishment.
However, the dialogue at times has become a little "expository".
A "disinterested" Sarah seems contempt with answering in full sentences. Only until the close of the conversation (Thereafter the reply of a short and sarcastic "Can't wait") does she really appear to be "disinterested".
John refers to Sarah by her name, in an overfriendly tone, when asking for the paper. Again, not an accordingly appropriate response to a disinterested companion.
The throw-back between the pair in the first scene regarding their professions I believe, is unecessary. SHOW, don't tell.
Perhaps rework that section of dialogue regarding their jobs/unemployment. It seems forced. Make it natural. The characters are natural, I got that feel after a page. But the folks I know, and I imagine they have been friends for a while, would not pursue a conversation with such strict, and informative -at the benefit of the audience, and not the characters/story-dialogue.
An example of your characters telling us the story.
JOHN
Got no response for that one?
SARAH
I just stopped caring
Both of these could be accomplished in two/three expressions. The emotion need not be spoken of.
Never allow your characters to become Narrators for your story. Everytime I hear/read expository dialogue, I imagine the characters holding huge bull-horns, screaming from the page. Listen to people having real conversations. Listen to the flow, and the give and take. There's a definitive chorus that flows through each conversation. Thousands of determining and contributng factors that must be recognised and understood to accomplish natural dialogue.
Page 5
INT. CAR - ???? (Clarification of day/night is still necessary)
Immediately, your "Action" is too vast. It needs to bite. Short, informative bursts. Try as you will to conform to the "3-4 line rule". It's all about pacing.
Remember that, as I'm reading this, I need to MOVE with your character/scene. If the action is too vast. We're static. We've paused. The pacing - especially within a comedy- has to punch, and, if possible, conform to the "1 minute per page rule".
Avoid using words ending in "ing". We're in the present. We have to live that moment with your character. It needs to happen as we're reading it.
I'm noticing a lack of description upon the locations. Each action begins with Johns actions. This falls within what I stated above about pacing, and quick, informative action. Give us something to go from. Where are we? We know it's a funeral home, but what can you give us, what can you say in one sentence, in a few words, that will transport us to this place with your character?
INT. FUNERAL HOME - LATE AFTERNOON
Long, barren hallways. Sinister portraits adorn the walls. The bitter stink of bleach.
Give us something to imagine. Not everybody has been to a funeral home.
Reading a few of the replies, I see this is yet to be revised. I won't comment on the spelling mistakes, you'll stamp them out. We all do it.
I'm currently 7 pages in. I'll try to come back to read further, but I've got a busy couple days ahead.
I'm always welcome to helping out when I can. If you've got any queries, PM me.
Best of luck!