You can easily do this in 'The Drivers Seat' mission (First Traffic Mission).
AT CRIME SCENE:
- Receipt in trunk / boot of the car
- (There is a tire iron, you can look at it, but it's useless)
- Wallet on the floor by the Letter A check both the ID and photo
- Glasses by Letter A (You will have angle these to get the clue)
- Bloody pipe by Letter B (Angle it to get brand name)
- Check inside the car and look at the very bloody aftermath
AT BLACK RESIDENCE:
- (Extra: There is a newspaper on the table to the right when you enter the house)
- Matches next to newspaper, look for address (Use phone to call in address)
- Photo on Margaret's dresser (Not important, but will be useful later)
- Glasses case in Adrian's room, open it up
- Photo of Adrian (Check closer for a clue)
- Train ticket to Seattle in Adrian's room
- In the kitchen on the table is a receipt
- On the same table there is a flyer, check the back of it and read to bottom for the clue
- Go outside and round side of house and fix together the InstaHeat pipe system, when finished there will be your last clue
AFTER INTERROGATING FRANK AT THE BAR:
- This is the clue everyone seems to miss, for this one you will need to be driving / sitting in a police car. A report will come through that the blood in the car is 'Swine Blood'
- When you arrive at Frank's apartment building, go to the mailboxes to find out which room Frank lives in
If there are any I've missed out or you cant find one that I have mentioned then please comment below and I will try and help :)