The writing in the journal found in Amos Delaware's (Gregory Cruz) hotel room is written in Canadian Aboriginal syllabics, a script used in Canada. Its development in the 1830s is attributed to Methodist missionary James Evans. It is primarily used to write languages in various dialects of the Cree languages as well as some Inuit languages.
Just after discussing potential baby names with Mac Taylor (Gary Sinise), Danny Messer (Carmine Giovinazzo) asks about the satellite picture of the property that is on the display in front of them. Danny mentions "4024 Radford" as the address. The address "4024 Radford" is the address of the CBS studio where the show is produced.
In the first and last shots of the screen on which Stella Bonasera (Melina Kanakaredes) is viewing the pages of Amos Delaware's Gregory Cruz journal, the left side of the screen is showing the journal script (Canadian Aboriginal script) and the right side is showing a layout of the Cherokee syllabic alphabet. The Cherokee script was invented around 1810 by Sequoyah, who, while not able to read any of the European languages brought to America, had access to books printed in English, Latin and Greek, so that some symbols resemble letters from those languages but with different sound values (for example, 'S' = 'du', 'Z' = 'no' and a Greek upper case gamma = 'hu'). Sequoyah spent twelve years refining his system, and by 1828 there were newspapers and books being printed in Cherokee. It can be seen in use today in parts of Oklahoma and North Carolina.
The language, the man in the red coat speaks, is Danish. When he gets in to contact with the guy, that ends up pulling the gun, the Danish man says "what's your problem?". When he is questioned by the Police, he says ".. what the hell should I do? What is the problem?". The first part of the sentence is a bit unclear.