No phone @ home

As a brief side note, there should be no land line phone in Griffins posession. Having one could imply ability to go on line via a modem.

To use a phone, he will have to go out to a phone booth across the street...

If the plot requires him being contacted, they can utilise a pager, prompting Griffing again to go out to a phone booth across the street to call his contact.

And when he inevitably gets tangled with something illegal (to him), in order to avoid eavesdropping, he will have to go find a random phone booth someplace to make his call.

This would bring some nice and cosy 50's agent movie look-and-feel about this movie - and maybe facilitate a humble bow towards the Old Masters too...