The Case of the Poison Pen-Pal S5 E20

Paul Drake worst detective ever. he gets spotted while trailing a women. from a peryy mason website:

When Paul Drake is staking out the Thatcher house, he is sitting in his snazzy new convertible, with the top down, on the same side of the street as the Thatcher house, in full view of everyone, including Doris Thatcher and Karen Ross (true, it is dark). He even walks right past Doris Thatcher on his way up to Karen Ross' house! I'm no private detective, but this makes no sense (except as a plot device). And we see the trouble this gets Paul into. And how were the police able to sneak up on him like that? Very sloppy work on Paul's part.