The Tragedy at Marsdon Manor - S3-E6
Samuel Naughton: Was the accomodation all right?
Hercule Poirot: No, monsieur Naughton. The accomodation was all wrong.
Samuel Naughton: Oh...
Hercule Poirot: The duck-feather pillows. It feels as if the duck are still in them. (00:14:50)
The Disappearance of Mr. Davenheim - S2-E5
Hercule Poirot: And please, do not fraternize with that creature. I am still training him.
Captain Hastings: It's only a parrot.
Hercule Poirot: I was talking to the parrot. (00:27:00)
The Adventure of Johnnie Waverly - S1-E3
Miss Lemon: [proudly showing her filing system] Type of case: Abduction. Addiction. Adultery - see also under marriage. Bigamy - see also under marriage. Bombs...
Hercule Poirot: See also under marriage? (00:04:00)
Hercule Poirot: A doctor who lacks doubt is not a doctor. He's an executioner. (00:14:40)
Wasps' Nest - S3-E5
[Poirot is stung by a wasp]
Hercule Poirot: The open air! It should be closed during the summer! (00:18:40)
Inspector Japp: Poirot, please, before I grow old, retire, and move to Brighton, who is it?