Introduction

Wash your hands, introduce yourself, and ask permission (consent) to examine. Ask if the patient has any pain before you begin.

Gait and Stance

Festinating gait (slow and shuffling movements when walking)
Decreased arm swing
Difficulty turning and initiating movements (patients may use a walking stick to 'poke' their feet to get them to move). Lines or markings on the floor can sometimes help.
Stooping posture
Postural instability

Hypomimia (decreased facial expression)
Blepharoclonus (fine eyelid tremor)
Resting tremor (brought out by distraction - such as conversation)
Tardive dyskinesia (chewing movements of the mouth - drug treatment side effect)

Glabellar tap (keep blinking - normally adjust)
Normal eye movements but abnormal vertical gaze + VOR (in supranuclear palsy) - speech ? monotonous voice

Tremor ('pill rolling', more pronounced at rest - as opposed to cerebellar tremors that are more pronounced upon initiation of movement)
Normal muscle bulk / reflexes / power
Increased tone: leadpipe rigidity (move whole arm around elbow joint) & cog-wheel rigidity (support forearm and flex/extend the flat palm at the wrist - cogwheeling is the jerky 'stepwise' movement that is felt due to tremor superimposed upon rigidity) ? these features are enhanced by asking the patient to move the other arm up and down as a 'distractor' or 'reinforcer'
Bradykinesia (slowness of movement - observed when patient is asked to flap arms up and down)
Finger-nose pointing (tremor decreases)

Micrographia (small writing)
Examine the observations chart for a postural BP drop (in the 'multisystem atrophy' form of Parkinson's)
Examine the drug chart (is this perhaps a drug-induced 'Parkinsonism' - caused by anti-dopaminergic drugs such as metoclopromide)
Examine the cerebellar system's function (also affected in 'multisystem atrophy')

To complete: Thank the patient.